- Open Access
Advancing the pragmatic measurement of sustainment: a narrative review of measures
Implementation Science Communications volume 1, Article number: 76 (2020)
Sustainment, an outcome indicating an intervention continues to be implemented over time, has been comparatively less studied than other phases of the implementation process. This may be because of methodological difficulties, funding cycles, and minimal attention to theories and measurement of sustainment. This review synthesizes the literature on sustainment measures, evaluates the qualities of each measure, and highlights the strengths and gaps in existing sustainment measures. Results of the review will inform recommendations for the development of a pragmatic, valid, and reliable measure of sustainment.
A narrative review of published sustainment outcome and sustainability measures (i.e., factors that influence sustainment) was conducted, including appraising measures in the Society of Implementation Research Collaboration (SIRC) instrument review project (IRP) and the Dissemination and Implementation Grid-Enabled Measures database initiative (GEM-D&I). The narrative review used a snowballing strategy by searching the reference sections of literature reviews and definitions of sustainability and sustainment. Measures used frequently and judged to be comprehensive and/or validated by a team of implementation scientists were extracted for analysis.
Eleven measures were evaluated. Three of the included measures were found in the SIRC-IRP, three in the GEM-D&I database, (one measure was in both databases) and six were identified in our additional searches. Thirteen constructs relating to sustainment were coded from selected measures. Measures covered a range of determinants for sustainment (i.e., construct of sustainability) as well as constructs of sustainment as an outcome. Strengths of the measures included, development by expert panels knowledgeable about particular interventions, fields or contexts, and utility in specific scenarios. A number of limitations were found in the measures analyzed including inadequate assessment of psychometric characteristics, being overly intervention or context specific, being lengthy and/or complex, and focusing on outer context factors.
There is a lack of pragmatic and psychometrically sound measures of sustainment that can be completed by implementation stakeholders within inner context settings (e.g., frontline providers, supervisors).
The implementation of innovations and evidence-based practices (EBPs) [interventions] is generally a long and complex process. Multiple phases have been identified and used to characterize complex implementation processes [1,2,3,4,5,6]. A common thread or goal amongst the derivations is a culminating phase wherein the intervention is “sustained” and integrated as routine practice. This final phase has been included as part of the implementation process and as an implementation outcome. For example, the Exploration, Preparation, Implementation, Sustainment (EPIS) framework identifies four phases with sustainment being the final phase .
Like many other dissemination and implementation (D&I) concepts, the range of terminology related to sustainment and sustainability has challenged the field. The most frequent terms include sustain, sustainment or sustainability, maintain or maintenance, continue or continued, and long-term or follow-up implementation [8, 9]. However, a multitude of other terms have also been used including adhere , penetration [10, 11], niche saturation , institutionalization , routinization , normalization , integration [15, 16], and community ownership . These terms largely relate to the integration of an intervention into routine practice, however, their operationalization differs. For example, within Proctor’s implementation outcome taxonomy, penetration is defined as “the integration of a practice with a service setting and its subsystems” , which similarly aligns with the concept of niche saturation and institutionalization. However, the number of recipients of the intervention (similar to RE-AIM concept of reach)  or the providers delivering/using the intervention (similar to RE-AIM concept of adoption)  are used as measures of penetration.
Similarly, a number of definitions [8, 9, 19,20,21,22] and frameworks [13, 23,24,25] of sustainment exist. The common and key definitions [8, 9, 24,25,26,27,28,29,30] have been methodically developed and there is growing consensus and application of these conceptualizations. Of note, the definition by Moore et al. “after a defined period of time, a program, clinical intervention, and/or implementation strategies continue to be delivered and/or individual behavior change (i.e., clinician, patient) is maintained; the program and individual behavior change may evolve or adapt while continuing to produce benefits for individuals/systems” . A further important definition along these lines is the definition by Shelton et al., “Sustainability has been defined as the continued use of program components at sufficient intensity for the sustained achievement of desirable program goals and population outcomes” .
Sustainment and sustainability definitions within the measurement literature are more disparate. The Society for Implementation Research Collaboration (SIRC) instrument review project (IRP) defines sustainability as “the extent to which a newly implemented treatment is maintained or institutionalized within a service setting’s ongoing, stable operations” . The Dissemination and Implementation Grid-Enabled Measures database initiative (GEM-D&I) adds to this definition of sustainability with, “the existence of structures and processes which allow a program to leverage resources to most effectively implement evidence-based policies and activities over time” . Other distinct definitions include: “sustainability as a process or ongoing stage, ”  “the extent to which an evidence-based intervention can deliver its intended benefits over an extended period of time after external support from the donor agency is terminated,”  “maintenance of treatment goals after discharge,”  “sustainability of those intervention outcomes or long-term effects,”  and “a suggested ‘adaptation phase’ that integrates and institutionalizes interventions within local organizational and cultural contexts” .
As indicated by the multiple review papers on sustainability and recent reconceptualization of sustainment in frameworks [8, 21, 25, 27, 35], there has been a general shift away from thinking of sustainment as an “end game” and more static conceptualizations of sustainment. Sustainment is a dynamic outcome that changes over time to meet the needs of changing context, needs, and evidence. Adaptation is central in the operationalization of sustainment. In light of this shift, there has also been discussion of the movement away from thinking about sustainability as synonymous with “institutionalization,” but that integration into routine practice must occur alongside adaptation to increase fit and to allow for continuous improvement.
There has also been debate on the distinction between sustainment and sustainability. One recent paper describes sustainment as “sustained use,” while sustainability as “sustained benefits” . Another commonly used description highlighting the distinction was developed by Chambers  who refers to sustainability as the “characteristics of the intervention that may lend itself to be used over time” as compared to sustainment which is referred to as an “outcome—was the intervention sustained over time,” further saying that “sustainment is an outcome of a sustainability effort” . This is an important concept whereby the process of planning for sustainment should occur throughout an implementation effort through considering the influences of sustainment, deemed sustainability. Palinkas and colleagues  also sought to conceptualize the concept of sustainability to encourage further examination and measurement within implementation efforts. They emphasize the elements of continuity and funding as well as conceptualizing sustainability as a process with determinants and an outcome (i.e., sustainment). While several common elements of sustainability determinants and outcomes emerged (e.g., including infrastructure, community buy-in, funding), they found that what distinguishes a determinant from an outcome varies, where outcomes are often distinguished as those elements that continued once funding and/or available support ended.
For the purpose of this review, we conceptualize sustainment as an outcome indicating that the intervention was continued over time. We summarize the specific components of sustainment based on our conceptualization and synthesis of the literature as being: (1) the input(s) (e.g., intervention, program, implementation strategy) continue to be delivered, through (2) routinization and institutionalization of the input(s), while adapting and evolving, and there being (3) ongoing capacity across levels (e.g., organizational, community and systems change) to support the delivery, so that (4) the outputs on the part of the health provider and/or health consumer (e.g., individual behavioral change, clinical benefits, value, impact) are maintained.
Sustainment has been comparatively less studied than other phases of the implementation process . There are multiple explanations for the paucity of work on this topic [8, 24, 27, 28]. Firstly, the time-limited nature or parameters of research grant funding cycles greatly impedes the ability to examine sustainment, especially the effects of long-term sustainment. The nature of current funding mechanisms are such that the time and funding allocated often necessitate a primary focus on one implementation phase, most frequently implementation, and do not allow for complete assessment of the degree to which newly implemented practices are sustained in a way that leads to positive outcomes for patients . As such, sustainment is often not considered or is deemed beyond the scope of a given implementation project. Further, those projects with a primary or secondary focus on sustainment are often limited to short-term examination (e.g., a few months to 1 or 2 years following implementation) or are separate projects and not linked to the prior implementation processes.
A second issue with investigating sustainment is methodological difficulties. Traditional study designs typically focus on more proximal or time-limited implementation outcomes such as fidelity, reach, or engagement . Some designs are inherently limited in the length of prospective follow-up. Designs such as interrupted time-series, and roll-out designs may provide the opportunity to examine sustainment more efficiently than some other more common randomized designs . It is important that these alternative study designs consider sustainment as the outcome that matters most in regard to improving public health impact, for return-on-investment, and in improving efficiency and effectiveness of implementation efforts . Methodological difficulties also arise because planning for sustainment is difficult due to the unpredictability of contextual changes (e.g., new or amended legislation, leadership turnover) or new learning that may occur.
Third, despite multiple reviews of the concept of sustainment, measurement of sustainment has received minimal attention and there appears to be a lack of psychometrically sound and pragmatic sustainment measures . Unlike other phases across the implementation spectrum, sustainment does not have a well-defined time period (i.e., the sustainment period can last indefinitely). Related, sustainment is ecologically complex, thus posing challenges to longitudinal measurement. Because the research examining intervention sustainment is still accumulating, it is not yet known what critical factors at each ecological level are essential to capture the dynamic process of sustainment.
To this end, this review synthesizes the literature on intervention sustainment measures and evaluates the qualities of each measure. We review and extend the current work on sustainment definitions, frameworks, and measures. This work highlights the strengths and gaps in existing sustainment measures to inform recommendations for the development of pragmatic, valid, and reliable measures of sustainment.
Known repositories of implementation measures, the Society of Implementation Research Collaboration (SIRC) instrument review project (IRP) [31, 43] and the Dissemination and Implementation Grid-Enabled Measures database initiative (GEM-D&I) [44, 45] were searched for measures of sustainment (or similar terms e.g., sustainability, maintenance). The SIRC-IRP aims to advance implementation science through measure development and evaluation. The IRP centers on the implementation outcomes framework put forth by Proctor and colleagues  and constructs outlined in the Consolidated Framework for Implementation Research (CFIR; Damschroder et al. ). The GEM-D&I is a project co-developed and introduced by the Cancer Research Network Cancer Communication Research Center at Kaiser Permanente Colorado and the National Cancer Institute’s (NCI) Division of Cancer Control & Population Sciences. The GEM-D&I database looks to create a growing and evolving community of users and resource to share standardized D&I measures that can lead to comparable datasets and facilitate collaboration and comparison across disciplines, projects, content areas, and regions. GEMS-D&I currently has 132 measures inventoried by construct. For this review, we looked at measures inventoried as sustainability.
In addition, we conducted a narrative review of studies purporting to measure sustainment to add to our catalogue of existing measures. Reference sections of literature reviews and definitions of sustainment and sustainability were screened and measures judged to be used frequently, comprehensive, and/or validated were extracted for analysis.
Data extracted from the measures included a description of the measure, the measure’s development process, respondent type(s), psychometric properties, timeframe examined, number of items and factors, scoring, and considerations. The generalizability of the measure and any other limitations or concerns were considered. For the measures that were quantitative scales, as opposed to open-ended questions or telephone surveys and that included ongoing delivery/use of an EBP and other dimensions of sustainment as an outcome, we also extracted the constructs of the scales. Extraction was performed inductively by two team members (JCM and AG). The extracted constructs were then collated under the components of our sustainment definition. Extraction continued until thematic saturation was reached and results were confirmed by a third team member (KSD). Team members and authors included national and international implementation scientists, including several with expertise in pragmatic measurement and measure development.
Eleven measures targeting or that included sustainment were identified across the GEM-D&I, SIRC-IRP, and other sources as described above. Three of the measures were found in the GEM-D&I database, three in the SIRC-IRP (one measure was in both databases), and six came from other sources. We briefly describe each of the measures and summarize them in Table 1.
GEM-D&I had six measures indexed as targeting sustainability, and three of these met criteria to be included in our review. The included measures are as follows: The Reach Effectiveness Adoption Implementation Maintenance (RE-AIM) framework [18, 35, 47], Level of Institutionalization Scale (LoIn) , Program Sustainability Assessment Tool . Three other measures linked to sustainability in the overall GEM database were excluded, with reasons as follows: The COMMIT questionnaire , as it is specific for the COMMIT study; the Hospital Elder Life Program Sustainability Measure , as it was a qualitative interview guide rather than quantitative measurement tool; and the Community-Based Participatory Research (CBPR) Model-Sustainability Measure , as it prospectively measures likelihood for sustainability.
The SIRC-IRP had thirteen measures rated as measuring sustainability. Three measures were included in our review: Evidence Based Practice Sustaining Telephone Survey , Program Sustainability Assessment Tool , and Program Sustainability Index . The remaining ten were excluded: School-wide Universal Behavior Sustainability Index-School Teams  and the Amodeo Counselor Maintenance Measure , as they were specific for a single intervention; the Change Process Capability Questionnaire , as it is a measure of an organization’s capability for successful implementation rather than an outcome measure; Eisen Provider Knowledge and Attitudes Survey , as it measures prospective intentions; Knowledge Exchange Outcomes Tool , as it does not measure constructs of sustainment; the Organization Checklist , as it is unpublished; the Prevention Program Assessment [Maintenance Scales]  and the Sustainability and Spread Activities Questionnaire , as items were not available for review; the Sustainment Cost Survey , as it measures costs only; and the General Organizational checklist , as it measures quality of delivery.
In addition to measures from the two databases, six measures were included from our narrative review: The Team Check-Up Tool (TCT) , Stages of Implementation Completion (SIC) , NHS Sustainability Model and Guide , a framework and a measurement instrument for sustainability of work practices in long-term care, NoMAD [14, 72], and the Clinical Sustainability Assessment Tool (CSAT)  (http://www.sustaintool.org/csat/). See Table 1 for a summary of included sustainment measures.
Part 1: Review of individual sustainment and sustainability measures (n = 11)
RE-AIM (Reach Effectiveness Adoption Implementation Maintenance) Framework and Tools [18, 35, 47]
RE-AIM was originally developed as a framework that consists of five elements or dimensions (reach, effectiveness, adoption, implementation, maintenance) that relate to behavioral health interventions or programs. Since the original publication of RE-AIM in 1999 , a number of tools have been developed to support the application of the RE-AIM framework in research-to-practice projects of health promotion and disease management interventions. Two of the resultant tools that have been developed are the RE-AIM Planning Tool and the Measuring the Use of the RE-AIM Model Dimension Items Checklist. In both tools, there is a separate section that includes specific questions for planners or evaluators related to the “maintenance” element of RE-AIM. In RE-AIM, maintenance is defined as the extent to which an intervention, program or policy becomes routine practice or policy at the setting and/or individual level, which corresponds to sustainment. The RE-AIM Planning Tool consists of 9 items (4 directed towards individual-level maintenance and 5 directed towards setting-level maintenance) that are primarily open-ended questions (e.g., “What do you plan to do to support initial success and prevent or detail with relapse of participants;” “What do you see as the greatest challenges to the organizations continuing their support of the program?”). The RE-AIM Model Dimension Items Checklist also consists of 9 items (5 directed towards individual-level maintenance and 4 directed towards setting-level maintenance) that are treated as a checklist for evaluation purposes (e.g., “Use of qualitative methods data to understand long-term effects;” “Some measure/discussion of alignment to organization mission or sustainability of business model”). These items refer to the maintenance time period as those activities that occurred following 6-month follow-up. There are no reported psychometric properties on the planning or evaluation tools. However, a recent systematic review characterizes the use of the RE-AIM framework as a whole . More recently, Shelton, Chambers, and Glasgow  published a perspective that calls for an expanded conceptualization of the RE-AIM framework, with explicit focus on equity and cost of implementation, to enhance the study of maintenance/sustainability. The authors recommendations of RE-AIM were as follows: to extend the time course of maintenance measurement, to at least 1 year post initial implementation and over time, to capture the dynamic “evolvability” of the EBP and implementation strategies; iterative and periodic re-assessment of RE-AIM dimensions to inform and document adaptations within a changing multilevel context; and explicit focus on equity and costs across RE-AIM dimensions (e.g., representativeness of patient/population subgroups) to promote long-term sustainability.
Goodman’s Level of Institutionalization (LoIn) 
The LoIn scale measures the extent to which an innovative health promotion program is integrated within its host organization. It is based on the theory that organizations are composed of production, maintenance, supportive, and managerial subsystems and that institutionalization occurs when a program becomes embedded into these subsystems. The level of institutionalization measures the extent to which an innovative program has gone through the stages of passages, routines, and niche saturation to become an integral part of an organization. Institutionalization corresponds to both sustainability and sustainment. The measure was developed and finalized following expert review and subsequent pilot testing. The resulting measure includes 45 items with eight subscales targeting routines and niche saturation across the subsystems. Routines and niche saturation items are scored on 4-point Likert-type scales. In terms of time period, the measure also includes sub-items related to the number of years activities have persisted. Psychometric properties were assessed through an examination of Cronbach’s alpha, interfactor correlations, and the relationship of factors to program years and perceived permanence. While LoIn developers describe internal consistency as “moderate to high,” Cronbach’s alpha ranged from .44 to .86. Furthermore, LoIn developers acknowledge that the scale is complex to complete and can only be completed by higher-level administrators.
EBP Sustaining Telephone Survey 
This measure is a 47-item interview that includes qualitative and quantitative items to report on the sustainability of the practices within the National Implementing Evidence-Based Practices Project for people with serious mental illness. The measure is divided into three sections assessing  whether or not the site continued the practice (and reasons for sustaining or not sustaining),  whether or not the practice had been modified to suit local contexts, and  factors affecting sustainability. The timeframe for using the measure is 2 years post implementation. The psychometric functioning of this measure has yet to be established, and scoring participant responses may be challenging particularly with regard to triangulation of quantitative and qualitative data.
Team Check-up Tool (TCT) 
Lubomski et al. developed the Team Check-up Tool (TCT) for monitoring team progress within a quality improvement (QI) intervention. Although the tool was developed for intensive care unit (ICU) patient safety collaborative teams, developers intended for it to be applicable across clinical areas. The original TCT is a two-part tool that elicits information about QI activities required for training, resources, or other aids to facilitate sustainment. The first part of the tool contains nine questions that ask respondents about specific facilitators, in terms of administrative activities and senior executive actions related to the QI intervention. The second part of the tool provides a list of ten potential barriers that slowed team progress in the previous month. The TCT aims to target factors that are predictive of the team’s failure or success. The TCT was later modified and the psychometric functioning of this modified version was examined by Chan et al. . The modified tool was expanded to contain 14 items in part 1 that assess education activities, use of the intervention, plus the original items assessing QI administration and senior executive activities. Part 2 of the modified TCT contains 13 potential barriers, and a part 3 was added, containing five items on contributors to poor team function. Cronbach’s α was .91 for team barriers. Spearman correlation assessing temporal stability was between .39 and .92 with 10 of the 13 items demonstrating at least moderate correlation between months. Change in barriers over time was not statistically significant, perhaps indicating a lack of measure responsiveness. Convergent and discriminant validity were supported, though predictive validity was not. Content validity, feasibility, and importance of the modified TCT was later assessed by Marsteller et al.  via two focus groups and a feedback session. Content validity index was found to be .87, though several barriers to completing the tool were uncovered and included the length of the tool, the month-to-month redundancy, the lack of feedback, and confusion about the tool’s questions.
Stages of Implementation Completion (SIC) 
The SIC is an observational, data-driven measure of implementation progress that is designed to be completed by an implementation team. It encompasses eight stages and 31 activities that span three implementation periods (pre-implementation, implementation, sustainability). The SIC yields three scores: (1) speed of implementation (duration of each stage), (2)] proportion of implementation activities completed within each stage, and (3) the number of stages (out of 8) completed. The SIC corresponds to the construct of sustainment. The time period examined pertains to the duration of each stage. The SIC developers recommend that researchers or program implementers contract with the SIC team for measure customization, data collection, and analysis. Data are collected on an ongoing basis during implementation from a variety of stakeholders including organizational and system leaders and providers. Completing the SIC can be a lengthy, iterative process. The SIC was evaluated using Rasch analysis, using a study of the implementation of Multidimensional Treatment Foster Care (MTFC). The data resulting from the measure (e.g., dichotomous proportion items of whether activities were completed or not and time-distribution duration items) do not easily fit psychometric measures of classical test theory. The initial analysis of the MTFC-SIC measure indicated preliminary evidence of reliability and validity.
National Health Service (NHS) Sustainability Model and Guide 
The NHS Sustainability Model is a self-assessment “diagnostic tool” to identify strengths and weaknesses in an implementation plan, to predict the likelihood of the initiative’s sustainability corresponding to the construct of sustainability. The Sustainability Guide is intended to provide practice advice on increasing the likelihood of an initiative’s sustainability. The Sustainability Model and Guide each consist of the 10 factors relating to process, staff, and organizational issues that play a role in sustaining change in healthcare. The Model and Guide were co-produced for the NHS by frontline teams, improvement experts, senior administrators, clinical leaders, people with content expertise from academia and other industries, as well as the literature on change and sustainability. In terms of the timeframe, the developers recommend repeated use of the tool for formative evaluation of quality improvement initiatives. Participants rate the level of each factor, by marking the description of each factor that best describes their local project. No specific time period for using the measure is referenced or assessed. A scoring system is provided to calculate scores for each factor, which are then added together to arrive at an overall sustainability score. Participants are encouraged to plot their scores to identify factors with greatest potential for improvement. The psychometric functioning of the tool has not been established; however, they state that a score of 55 or higher offers reason for optimism.
A framework and a measurement instrument for sustainability of work practices in long-term care 
Slaghuis et al.  developed a measure to test the integration of small improvement interventions implemented via the Breakthrough method in long-term care organizations in the Netherlands. The sustainability framework is based on the concept of work practices and organizational routines where sustainability is seen as “a dynamic process in which actors in a target work practice develop and/or adapt the organizational routine to a new work method”. This process is centered on the concept of routinization and institutionalization [12, 71]. Routinization is the molding of the new work practice to fit the organization, while institutionalization is the embedding of the new practice in the organization, incorporating the support and context aspects required for sustainment. Three domains were attributed to routinization (routinization via principles, practices, and feedback) and four to institutionalization (institutionalization of skills, documentation materials, practical materials, and team reflection). These domains correspond to the construct of sustainment. For each domain measurement, developers designed a scale of 5–10 statements rated on a 5-point Likert response scale, with no specific time period for assessment mentioned or referenced. Structural and content validity were assessed by the developers and 11 experts. The psychometric properties of an initial 52-item instrument were assessed in a sample of 112 individuals, from 63 teams, with imputed missing data. Construct validity was assessed with structural equation modeling (SEM) and principal component analyses (a hierarchical two-factor model with routinization and institutionalization as separate constructs was best fit with high factor loadings, but some cross-loadings), and reliability with Cronbach’s alpha (all subscales were above 0.7). A short version (31 items) and long version (40 items) are available. Further psychometric analyses would be beneficial to address the low response rate (33%) and small sample size (n = 112, across 63 teams, with missing data). A limitation of this measure is that items are not generalizable across all contexts and innovations.
NoMAD [14, 72]
Finch et al. developed and validated the NoMAD measure to assess activity related to the normalization of complex interventions based on the Normalization Process Theory (NPT), corresponding to the constructs of sustainability and sustainment. The NoMAD developers intend for the NoMAD to be a pragmatic measure of implementation processes and encourage users to apply it flexibly to their implementation research and practice needs. The NoMAD developers describe the NoMAD “as an adaptable ‘bank of items’” . Data from six implementation projects were assessed to determine the items and factor structure, as well as to examine the psychometric functioning of the resulting NoMAD measure. These six implementation projects varied with regard to the kinds of interventions being implemented (digital health, smoking cessation, patient self-management, oral health risk, system-level IT, sports program), implementation timelines, and professionals involved in the implementation activities (clinical, administrative, managerial, and other professionals in non-health contexts). Resulting items consist of 20 construct items and 3 normalization items, though users are encouraged to adapt the text for their own research and practice needs. Each of the 3 normalization items is answered using an 11-point visual analog scale ranging from 0 to 10, and assesses the extent to which the intervention feels familiar, is currently a normal part of work, or will become a normal part of work. The 20 construct items include four sub-sections assessing the four NPT constructs: coherence (4 items; α = .71), cognitive participation (4 items; α = .81), collection action (7 items; α = .78), and reflexive monitoring (4 items; α = .65). Individuals are instructed to complete the construct items by selecting an answer from option A or option B depending upon the relevance of the item. Specifically, option A includes a 5-point Likert-type response option ranging from strongly agree to strongly disagree. Option B includes three response options, “not relevant to my role,” “not relevant at this stage,” and “not relevant to the intervention.” An overall normalization scale comprising items from across the four construct sub-sections is also available (20 items; α = .89). No specific time period is assessed or referenced. The measure shows promise as a measure of sustainability and potentially sustainment if cut-off scores are defined. Further testing across contexts and test-retest reliability are recommended.
Program Sustainability Assessment Tool (PSAT) 
The PSAT assesses the capacity for program sustainability of various health programs corresponding to the construct of sustainability. The measure was based on the developers’ prior literature review and concept mapping study that resulted in 40 items across 8 domains, with 5 items per domain, with no specific timeframe. Domains include political support, funding stability, partnerships, organizational capacity, program evaluation, program adaptation, communications, and strategic planning. In the original measure development publication, internal consistency was reportedly high with Cronbach’s alpha values ranging from .79 to .92. Measure developers conducted multiple-group confirmatory factor analyses to test factorial invariance across program level (state and community) and program type (e.g., tobacco, obesity, diabetes, oral health). While no difference in psychometric functioning was found between program types, the PSAT functioned differently between community and state programs. A limitation with the measure is that it targets current capacity for future sustainment as opposed to evaluating the quality of program sustainment following initial implementation. The tool also requires higher-level organizational knowledge so it cannot be completed by frontline workers/service providers.
Clinical Sustainability Assessment Tool (CSAT) 
The CSAT measure was adapted from the PSAT based upon a literature review and expert-informed concept mapping. The resulting tool is a 35-item self-assessment that clinical staff and stakeholders complete to evaluate the sustainability capacity of a practice. The developers define clinical sustainability as “the ability of an organization to maintain structured clinical care practices over time and to evolve and adapt these practices in response to new information” . While the PSAT intends to assess a wide range of public health programs, the CSAT intends to assess the sustainability capacity of a clinical practice. The CSAT assesses the following seven domains: engaged staff and leadership, engaged stakeholders, organizational readiness, workflow integration, implementation and training, monitoring and evaluation, and outcomes and effectiveness. Respondents rate practices using a 7-point scale indicating the extent to which the practices are supported by these domains of processes and structures hypothesized to increase the likelihood of sustainability. Information regarding the psychometric functioning of the CSAT is not yet available and developers are in the “process of validating the tool” .
Program Sustainability Index (PSI) 
The PSI was developed to assess the attributes of sustainability among community programs. The measure was informed by a model of community-based program sustainability consisting of three cascading and/or sequential and linked domains: program sustainability elements (e.g., leadership, collaboration), middle-range program results (e.g., needs met, effective sustainability planning), and followed by the ultimate result of program sustainability. Development was also informed by the results of mixed methods studies examining elements of community program sustainability. Comprised of seven subscales, the PSI assesses both outer and inner context factors, including leadership competence, effective collaboration, understanding community needs and involvement, program evaluation, strategic funding staff integration, and program responsivity. Two items from the Leadership Competence and Strategic Funding subscales mention a timeframe of at least 2 years for assessment by the PSI. The PSI is administered by qualitative interviews or as a web-based survey to multilevel administrators. It has been used in child welfare, Veterans Affairs medical centers, and hospitals. Informed by factor analytic examination of measure structure and fit, the final measure is comprised of 29 items rated on a 4-point Likert scale. Cronbach’s alpha ranged from .76 to .88, indicating strong internal consistency. Measure limitations include knowledge required of both inner and outer context to complete and the focus is on sustainability versus sustainment.
Part 2: Sustainment measure constructs
Six measures were quantitative scales measuring sustainment and therefore had their constructs extracted and reviewed. The constructs from the measures were thematically extracted, which inductively resulted in 13 construct domains (see Table 2). In addition to continued delivery, three constructs relate to sustainability processes and benefits of the intervention: (i) monitoring (including fidelity and benefits), (ii) adaptation and improvement, and (iii) reflection and team involvement. Two constructs relate to the integration of the intervention, (i) institutionalization and (ii) routinization, and three constructs relate to the outer context (as defined by EPIS) [5, 7], (i) external support and communication, (ii) partnership, and (iii) financial resources and funding. Outer level constructs were contained in five of the six measures. There were three constructs relating to the inner context (as defined by EPIS [5, 7]), (i) leadership support and organizational climate, whereby there was innovation-fit with the goals and direction of the organization, (ii) organizational capacity in terms of sufficient resources and workforce, and (iii) training provided. Inner context, organizational constructs were contained in all measures. Finally, one construct encompassed the individual-level factors of staff support, their behaviors, and attitudes towards the EBP/innovation. The inner context, individual-level construct was found in five of the six measures reviewed.
To extend the evidence base on pragmatic sustainment measurement, we conducted a multistep narrative review of sustainment measures. Using two large implementation science measure databases (GEM-D&I and the SIRC-IRP) and a supplemental narrative review of the literature, we identified 11 sustainment measures that met our review criteria of being used frequently, assessing sustainability/sustainment, and judged to be comprehensive and/or validated.
The recent acknowledgement of the need for both psychometrically strong and pragmatic measures is highlighted in the results of this review . Out of the eleven measures meeting criteria, three were deemed time-intensive (e.g., many including as many as 40 or more items) and/or complex to complete (e.g., suited for interview style data collection). A related issue was that some measures required stakeholders at multiple levels or knowledge across multiple levels to complete. In general, the items in most measures were not well-suited for frontline providers to complete, but instead, existing measures were best suited for or required high-level administrators or executives with knowledge of EPIS or CFIR outer context factors such as community partnerships, funding arrangements, contracting, or financial resources. The sustainment of interventions, and especially discrete EBPs, relies on the inner context of health organizations and service providers delivering care [74, 75]; however, the available sustainment measures primarily assess outer context influences. While critical for implementation, questions related to outer context may be challenging for stakeholders delivering care to answer and can only be completed by a small subset of stakeholders (e.g., government administrators, organizational executives) . Pragmatic measurement of sustainment should include measures from different perspectives, including measures that may be completed by inner context stakeholders such as direct service providers and supervisors whose voice has not been fully represented.
The methodology for developing the reviewed measures varied widely. While some measures were based on sustainability frameworks (e.g., the PSAT was based on the capacity for sustainability framework) , others were less explicit about the items’ theoretical origins. Along with the range of sustainability definitions, there is a range of sustainability frameworks (e.g., Dynamic Sustainability Framework ) and implementation frameworks that include sustainability (e.g., EPIS [5, 7], CFIR , PRISM ). Ideally measures of sustainment and sustainability should map onto these frameworks . Furthermore, there are a number of reviews of sustainability influencing factors [8, 27, 78, 79]. It was positive to see our findings, extracted as the sustainment measure constructs (Table 2), broadly align with these reviews. Of note, while some constructs regarding sustainability processes such as monitoring, and adaption and improvement did appear in the reviewed measures, others including planning, technical assistance, and navigating competing demands did not arise. In addition, the structural characteristics of the organization and characteristics of the intervention, implementer(s), and population were not explicitly included.
It is important to consider the time in which an intervention has continued to be delivered/used when measuring sustainment. Results suggest that half of the examined measures did not specify the time period for measuring sustainment. Among the remaining measures, the time period varied from a 6-month follow-up period (the original RE-AIM Framework Dimension Items Checklist)  to over 2 years (evidence-based sustaining telephone survey  and PSI ). For one measure, the SIC , the sustainment period was variable and project specific, informed by the time of implementation initiation and completion. Guidance or inclusion of the timeframe of sustainment should be modeled off recommendations that suggest measurement should occur 12 months, but ideally 2 or more years after implementation . However, it is also possible to measure sustainment earlier in the implementation process to capture its dynamic nature and as a formative tool to tailor implementation strategies and plan for sustainment. This is aligned with the extension of the RE-AIM framework’s focus on “evolvability” across the life cycle of implementation with a goal of contributing a sustainable and equitable health impact rather than on sustainment alone as a set end point .
While the majority of measures were validated questionnaires, one measure from the GEM-D&I—the RE-AIM Maintenance Measure—has an open-ended structure to examine the individual and organizational-level long-term effects of a program on outcomes. Combined use of a more qualitatively oriented measure along with a brief, validated questionnaire may be a method to consider for research or practice-based projects with greater resources. Further, of the 11 measures identified, there were no measures deemed to be applicable across settings and that can be tailored for particular EBPs. This is greatly needed because of the growing number of implementation efforts involving the implementation of multiple EBPs concurrently or sequentially [74, 80, 81]. While continued delivery and adaptations over time may require an intervention-specific sustainment measure, we feel a generic sustainment measure that captures the broad constructs of sustainment would assist in creating generalizable evidence within implementation science. Sustainment measure development may be aided by the timely questions posed in the extension of the RE-AIM framework  that focus on health equity and dynamic context (e.g., Are the determinants of sustainment the same across low-resource and high-resource settings?).
There are challenges in rating the pragmatic qualities of implementation science measures. We applied the guidance from the recommended criteria for pragmatic measures by Glasgow and Riley  and the Psychometric And Pragmatic Evidence Scale (PAPERS) . However, we found that the former was better-suited for evaluating patient/client-directed measures while the latter required data that was not available for us to complete ratings (e.g., level and types of stakeholder involvement in measure development).
The review highlighted that there appears to be currently no pragmatic, psychometrically strong measure of sustainment that can be easily completed by inner context providers. For good reason, the reviewed measures contain both inner and outer context factors. The majority of the measures require knowledge of external or bridging factors such as communication and partnerships with community members and politicians, and securing funding. The requirement of multilevel knowledge creates issues for respondents and we feel separate scales completed by stakeholders at different levels within the context have a place within implementation science. The review of the constructs provides guidance on the key constructs for inclusion in a pragmatic inner context measure of sustainment (Table 2). In summary, we believe a measure of inner context sustainment provides an important perspective in measuring sustainment. Such a measure could be used in combination with intervention-specific assessment of core component continuation (e.g., sustained fidelity) and adaptation, measures of intervention outcomes (e.g., patient or provider benefits), and measures of outer context sustainment (e.g., funding stability).
Our review was not intended to be systematic or scoping review of all sustainment measures. Rather, our purpose was to identify the currently available and accessible measures of sustainment for implementation researchers and practitioners. In doing so, we have identified several research considerations to advance pragmatic and psychometrically robust measurement of sustainment.
There is a lack of pragmatic and psychometrically sound measures that can be completed by implementation stakeholders within inner context settings (e.g., frontline providers, supervisors). Further, there are a limited number of measures specifically addressing sustainment versus similar constructs of sustainability. Among these, current measures of sustainment are specific for particular settings or interventions, focus on outer context factors, and may be complicated for stakeholders to complete because of the outer context knowledge required. Our next steps are to address this need for a pragmatic measure of sustainment for inner context influencers that focuses on the integration and support perceived at a provider level.
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Dr. Aarons is a core faculty and Drs. Dickson and Stadnick is a fellow with the Implementation Research Institute (IRI), at the George Warren Brown School of Social Work, Washing University in St. Louis; through an award from the National Institute of Mental Health (5R25MH08091607).
This project was supported in part by the US National Institute of Mental Health R03MH117493-01 (Aarons, Moullin, Sklar), K23MH115100 (Dickson), K23MH110602 (Stadnick), and National Institute of Drug Abuse R01DA038466 and R01DA049891 (Aarons, Sklar). The opinions expressed herein are the views of the authors and do not necessarily reflect the official policy or position of the NIMH, NIDA, or any other part of the U.S. Department of Health and Human Services.
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Moullin, J.C., Sklar, M., Green, A. et al. Advancing the pragmatic measurement of sustainment: a narrative review of measures. Implement Sci Commun 1, 76 (2020). https://doi.org/10.1186/s43058-020-00068-8
- Psychometric properties
- Knowledge Translation