Interventions to Support System-level Implementation of Health Promoting Schools: A Scoping Review

Health promoting schools (HPS) is recognized globally as a multifaceted approach that can support health behaviours. There is increasing clarity around factors that influence HPS at a school level but limited synthesized knowledge on the broader system-level elements that may impact local implementation barriers and support uptake of a HPS approach. This study comprised a scoping review to identify, summarise and disseminate the range of research to support the uptake of a HPS approach across school systems. Two reviewers screened and extracted data according to inclusion/exclusion criteria. Relevant studies were identified using a multi-phased approach including searching electronic bibliographic databases of peer reviewed literature, hand-searching reference lists and article recommendations from experts. In total, 41 articles met the inclusion criteria for the review, representing studies across nine international school systems. Overall, studies described policies that provided high-level direction and resources within school jurisdictions to support implementation of a HPS approach. Various multifaceted organizational and professional interventions were identified, including strategies to enable and restructure school environments through education, training, modelling and incentives. A systematic realist review of the literature may be warranted to identify the types of intervention that work best for whom, in what circumstance to create healthier schools and students.


Introduction
School health interventions are most effective in supporting chronic disease and cancer prevention when they target multiple environmental and behavioural components and incorporate a complementary community strategy [1][2][3][4]. Health promoting schools (HPS) is recognized globally as a multifaceted approach that can support prevention behaviours of healthy eating, physical activity and tobacco use by modifying the social and physical environments in schools [5,6]. In doing so, HPS advocates for health promotion (HP) actions that influence social norms and improve access, resources, and supports for healthy behaviours [5,6]. There are increasing international calls to action that advocate for increased support for HPS [7]. However, this support may be undermined by persisting challenges that obstruct uptake of HPS across multiple levels [8][9][10][11][12]. Although a recent review identified factors facilitating a HPS approach at a school-level [13], there is limited synthesized knowledge on the broader elements that facilitate a HPS approach at a school system-level.
Systems-thinking offers a theoretical lens that recognizes interrelationships and interactions across stakeholders that are tied together by organizational structures, processes and contexts but require stronger linkages to promote behaviour change within and across systems [14][15][16]. This perspective is appropriate for interventions within the education system considering the interdependency of a range of system-level elements [17] (e.g., government ministries may develop HPS standards and offer professional development for groups of schools). Bronfenbrenner's ecological model offers an overall framework to consider the interrelationship among actors and structures across multiple levels in schools; the macrosystem influences the overall institutional structure, such as the educational, social, economic and political systems; the exosystem constitutes other informal and formal social structures, such as government ministries or departments and school districts that are responsible for a sub-section of schools; microsystems focus on relationship between individuals and their immediate settings; and mesosystems comprise interactions between microsystems [18]. Implementation of a HPS approach aligns with an ecological model as it is influenced by education and social policy (macrosystem) and by social structures (exosystem) that can shape the availability of resources to help build supportive physical and social environments (microsystem) [5,[19][20][21][22][23]. HPS is also a collaborative and multi-component approach that engages partners in the community (mesosystem), such as public health, recreation, non-government organizations, local business and universities [5]. Focusing on system-level actions can ensure synergy between decisions (macro-and exosystem) and operations [24] (microsystem).
Although there is increasing clarity around factors that enable HPS to operate successfully at a school level (e.g., school leadership, culture and capacity within the school, support from parents/community) [13], there is limited synthesized knowledge on the broader system-level elements that facilitate a HPS approach. Examining the capacity of the overall system is important as it allows a consideration of how actors work together to engage in the creation and co-production of interventions to improve performance, adaptation and innovation related to a HPS approach [23][24][25][26][27]. For example, different levels of the system could implement actions that focus on alignment of curriculum with HPS goals, professional development and networking opportunities that encourage knowledge exchange and provision of resources to support implementation. These actions may address local implementation barriers and ensure synergy between decisions and operations across education systems to support uptake of HP evidence [24]. Michie and colleagues considered behaviour change as part of an interacting system and recently validated the Behaviour Change Wheel (BCW) as a method of characterizing and designing behaviour change interventions for tobacco control and obesity prevention [28]. This comprehensive framework was developed from a review of 19 behaviour change frameworks and provides a useful structure to characterize the types of interventions and policies needed to support system-level uptake of a HPS approach [28]. The BCW links policy options and intervention functions to sources of behaviour that could be targeted to achieve change. Intervention functions are described as nine broad categories of interventions that could be used to change behaviour. Seven policy categories are detailed that support delivery of the different intervention functions (see Table 1) [28].
Scoping review studies offer an approach to knowledge synthesis that broadly describe relevant literature across various study designs. Scoping reviews are conducted to examine the range of existing literature and gaps related to a topic, to determine the need for a systematic review or to summarise and disseminate research findings [29,30]. Considering the importance of a systems-level perspective on a HPS approach and the lack of synthesized literature on system-level elements, a scoping review was warranted to identify, summarise and disseminate the range of research to support the uptake of a HPS approach across school systems. The second purpose was to determine existing gaps in the literature of the review to determine the need for a more systematic review of the literature. We used Bronfenbrenner's ecological model to consider systems-level influences as well as the BCW policy categories and intervention functions to inform potential strategies to influence HP policy and practice [28]. The review responds to the following question: What intervention functions and policy categories support implementation of a HPS approach across school systems?

Methods
We adhered to Arksey and O'Malley's [29] guidelines on scoping reviews and the recommendations outlined by Levac and colleagues [30] to maximize the rigour and utility of our review findings. The details of the methods are outlined in Table 2 according to the six framework stages. The population for this review included various types of school systems (e.g., collections of schools within a country, province/state, local district/board rather than individual schools) related to student health outcomes focused on modifiable risk factors for chronic disease and cancer (e.g., physical activity, healthy eating, tobacco control). Within the scope of this literature, the focus was to identify the types of system-level interventions that can facilitate uptake of a HPS approach at a school-level.
The primary author worked in collaboration with a health sciences librarian to develop a search strategy including relevant search terms for three electronic bibliographic databases of peer-reviewed literature: PubMed, Web of Science, ERIC (Years 1999-2015, see Table 2). The primary author also consulted with a group of 14 international HPS experts to identify other important studies to include in the review. Two reviewers independently screened titles using pre-specified inclusion/exclusion criteria to determine their suitability for the review. The reviewers discussed discrepancies, challenges and uncertainties related to study selection after independent review. During subsequent screening, remaining abstracts and then full-text articles were independently reviewed for inclusion by the same two reviewers. The reference lists of included studies were further hand-searched to identify additional relevant articles and provide further system and jurisdictional context related to the included articles. Data were extracted from included studies by two reviewers using a structured data extraction sheet (see Table 3). Key findings across all studies were synthesized by coding extracted data according to the variables of interest to identify implications for research, policy and practice [30]. Table 2. Scoping review framework stage details.

Framework Stage Details
Step Step 3:

Study selection
Inclusion criteria: Publication time scan (1999-2015, date based on release of HPS reviews in 1999); English language; school system actions (not individual schools); intervention/primary study published in peer-reviewed paper. Exclusion criteria: Not focused on actions at the system-level (i.e., focus on individual schools or beyond school/education system); health outcomes not focused on modifiable risk factors for chronic disease (physical activity, healthy eating, tobacco control) and mental health; concept paper without information on a specific education system.
Step 4: Charting the data Two reviewers extracted data from final articles and charted according to variables of interest, including policy categories and intervention functions.
Step 5: Collating, summarising and reporting the results Results synthesized and interpreted according to the research questions as well as key issues and themes relevant for practice and policy.
Step 6: Consultation Results will inform future consultation with experts and identification of next steps, including possible inclusion of grey literature and/or systematic realist review.

Results
A total of 628 studies were identified for possible inclusion, reduced to 277 after title review and 123 after abstract review ( Figure 1). Through an iterative process of full article review and hand searching of reference lists between two reviewers, 41 articles met the final criteria for the review. Table 3 describes the final studies included as part of this review. Studies were grouped according to similar system-level context (i.e., multiple studies about the same regional school system or project). Overall, the included studies targeted all levels of the school system in Austria, Norway, United Kingdom, Canada (provinces Alberta, Quebec and the Youth Excel network), United States (including states Michigan, New England, Pennsylvania, Colorado, Arizona, South Carolina), Australia (Western Australia and South Australia ), New Zealand and the Western Pacific (Taiwan and Hong Kong). The majority focused on the school system across both primary and secondary schools (n = 31, with seven of these also including other school types such as vocational and preschool), including some with younger children (e.g., pre-school) and others with post-secondary school (e.g., vocational, technical and vocational schools. Other systems focused solely on secondary schools (n = 3) or did not specify the age of students in the article (n = 7). Various research methods were used across all studies, including descriptive program review, case study methodology and qualitative and quantitative methods.

Ecological System Context
Included studies are described below according to the ecological system context in their respective region and country and their relevance to the ecological system (ecological level identified in italicised font).

Primary and secondary schools
To examine teachers' perception of school factors that facilitated participation in HP.
Enablement: compensating teachers for time spent on HP (also incentivisation); Modelling: networks with other teachers; ER: focus on school planning documents.

Primary and secondary schools
To explore the processes involved in developing and implementing the HP at local level.
Descriptive: report on process evaluation of multiple case study approach and focus group with students and teachers.
Enablement: financial resources to support HP development (also incentivisation); Training: provided from external professionals (also education); ER: improving the physical environment of the school.   [47].

Primary and secondary schools
To provide rationale and describe progress for vision to jointly set HP actions.
Descriptive: program review and description of model. Mixed methods: document analysis, interviews with key informants at provincial, regional and local levels (n = 34).

Primary and secondary schools
To present the project model for creating HP in schools based on the experience of working with schools.
Descriptive: model and program description.
Western Australian School Health Project Enablement: providing resources and supports (also training, education and incentivisation) to support HP planning (also environmental restructuring) improved comprehensiveness and quality of health strategic planning.

Primary and secondary schools
To examine if an HPS action-research approach was effective in advancing HP implementation, perceived impact and efficacy in Taiwan.

Primary and secondary schools
To examine the efforts of a school district to develop, improve, and sustain HP.
Descriptive: case study Enablement: internal and external supports and resources supported implementation (also incentivisation, environmental restructuring); Incentivisisation: supportive policies, procedures and management structures; Training: ongoing professional development (also education).

Europe
There is a rich history of a HPS approach in Europe, with the European Network for HPS being established in 1993 and re-launched as "Schools for Health in Europe" to link national programmes and networks that had started to develop [31]. The network encourages its 43 member countries to develop and implement a national policy on school HP, to build on the experiences within each country [31] (macrosystem). In Austria, schools (microsystem) are dependent on varying external and political supporting structures for implementation across various provinces and regions (exosystem) [32]. Three Austrian studies investigated capacity building in relation to provincial support strategies [33], perceived support by schools [32] and provision of a pilot training course [34] (micro-and exosystem) and two other studies examined a regional network through stakeholders perceptions of learning [35] and side effects of HP [36] (micro-and mesosystem). Five studies in Norway discussed participation of schools in the Norwegian network of HP in terms of program leader support [37], teacher motivation and participation [38] and school implementation [39][40][41] (micro-and mesosystem). In Scotland, HP is well integrated into the school system, with all schools being required (and being monitored) to become a HPS since 2007 (macrosystem). Three studies discussed the overall national approach to support HPS, including one that focuses on the higher-level processes that led to HP implementation [42] and two earlier studies (i.e., before the HPS requirement) that reported on factors involved with implementation at a school level [43,44] (micro-and exosystem). One study in Wales assessed the implementation of a network of healthy school schemes [45] that were established following funding that was provided to all local authorities for the appointment of healthy schools coordinators whose role was to establish and maintain local schemes (micro-, meso-and exosystem).

North America
There is no federal policy related to HPS in Canada (macrosystem) but provinces/territories have developed and implemented guidelines and support for HPS relevant for their jurisdictional context (exosystem) [46]. The Pan-Canadian Joint Consortium for School Health is a partnership between provincial, territorial and federal governments in Canada that provides leadership by enhancing alignment between health and education across multiple sectors rather than creating national policy [19]. Youth Excel (Youth Health Collaborative: "Excelerating" EVIDENCE-informed ACTION) was a pan-Canadian network that aimed to accelerate the dissemination and implementation of evidence-informed HP policy and practice through collaborations across jurisdictions and research, policy and practice sectors [47]. One study provided rationale for the vision of Youth Excel to have priorities for action jointly set and actions leading to continuous improvement in HPS and described the initial progress of the network [47] (meso-and exosystem). Two studies described key lessons learned [48] and how knowledge development and exchange was built through the network [49] (mesosystem). Included studies also described the specific jurisdictional systems in two regions (exosystem). Ever Active Schools is a provincial non-government organization that works with school communities in Alberta to implement the HPS approach [50] (exosystem). The Battle River Project in Alberta was supported by Ever Active Schools and the Battle River school division and provided school with evaluation and planning tools, release time for teachers, knowledge exchange opportunities, access to expert advice and support from a part-time coordinator to implement HPS. One study described the process that led to the development of implementation of the HPS model [51], a second examined the effectiveness of the model [52] and the final discussed how evidence was used to support school implementation [53] (micro-and exosystem). In Quebec, a joint initiative for HP has been offered on a voluntary basis since 2004 by the Ministry of Education and the Ministry of Health and Social Services and support is provided to schools by designated regional and local agents [54]. Three related studies described a conceptual model for HPS identifying key facilitating features [55], documented a professional development model and implementation process and its influence on stakeholder knowledge and practices [56] and examined how stakeholders concepts of HP may influence dissemination across the province [57] (micro-and exosystem).

The United States Centers for Disease Control and Prevention supports a Coordinated School
Health (similar to HPS) model and created the School Health Index (SHI) in 2000 to provide educators with a tool to help school staff evaluate the strengths and weaknesses of school-based health promotion programs and policies and plan for further improvement [58] (marcosystem). Further, all schools participating in the National School Lunch Program or other child nutrition programs must have created a local school wellness policy by 2006 [59] (macrosystem). In response to the federal system, many states and school districts have developed regional infrastructure to support implementation in schools. This review identified a study in New England and Arizona that examined the use of the SHI with support from outside community partners [60,61] (micro-, meso-and exosystem). The Pittsburgh (Pennsylvania) school district used the SHI planning tool for developing collaborations and solidifying relationships between a public university and the school district to help the district launch HPS [62] (micro-, meso-and exosystem). Two studies described case studies supporting HP through the Mariner project in South Carolina [63] and a school district in Colorado [64] (micro-and exosystem). Finally, the MICHIANA HPS Leadership Institute was developed to build local HP infrastructure capacity in Michigan through training that emphasizes school and community partnerships to develop HP infrastructure and provides assistance to support local school district activities and actions. One study assessed the extent to which school systems met expectations for building HP capacity [65] and another examined common themes by participants at the Institute [66] (micro-, meso-and exosystem).

Australia
In Australia, there is no federal policy specifically related to HPS and the investment by the government remains largely focused on the health sector to address specific priorities [67] (macrosystem). Studies identified in this review have reported on specific regional initiatives. In Western Australia, two studies reported on an intervention of over 70 schools provided ongoing support for health promotion through staff and parent training, access to an expert and time for school representatives to plan and implement health promotion activity [68,69] (micro-and exosystem). With South Australia, one study examined the "CREATE healthy eating in schools" program is helping to support schools to implement healthy eating guidelines in schools using a HPS approach by providing grants, workshops, resources and planning tools, training program, membership to network and nutritionist support [70] (micro-, meso-and exosystem). In the Hunter Region HPS model in New South Wales each school was allocated a liaison officer whose role it was to encourage adoption of HP and facilitate progression [71] (microand exosystem). Finally, in the same region the School Health Incentive Program grants scheme offers small grants, support for experts and access to services and resources was evaluated by one study in terms of its ability to enhance the capacity of schools to develop and implement health initiatives using the HPS framework [72] (micro-and exosystem).

Western Pacific
A HPS approach has been supported by the World Health Organization as part of the dissemination of their Global School Health Initiative in 1995 across the Western Pacific [73] (macrosystem). The Taiwan Ministry of Education and Department of Health signed a Joint Declaration of HPS in 2002 and by 2008 all primary and middle schools were required to implement HPS. In 2004, supports were initiated to facilitate HP adoption through a network, teacher training and resource center and website and support was expanded in 2011 with an action research school-district/university partnership program. Experts from universities participated in support network by providing technical support and local school action research training workshops to build teacher capacity and support implementation [74]. One study examined the support of the partnership program on continuous improvement for HP [74] and another assessed if the action research approach was effective in advancing HP implementation [75] (micro-, meso-and exosystem). In Hong Kong, HPS was first launched in 1998, and further developed as a Healthy Schools Award Scheme in 2001 with an aim to promote educational achievements, and to enhance the well-being of school students and staff [76]. An overall evaluation framework and data collection plan was described [76] as well as individuals studies reporting how schools performed under the award scheme [77], if comprehensive adoption of the HPS model led to improved health and learning outcomes of students [78] and the status of HPS across schools [79] (micro-and exosystem).

Policy Categories and Intervention Functions (Identified through Italicised Font)
The level of detailed description of policy context varied across included studies (Table 3). Guidelines, environmental/social planning and service provision were the most commonly reported policy categories (Table 3). Some form of guidelines for HP existed in all countries and many were used to facilitate implementation of HPS and change educational norms for schools (i.e., environmental/social planning). Service provision was identified through training and coordination support. Forms of legislation and regulation were only identified in a few countries. Scotland had a legislative requirement for HPS to be integration in all schools (which was also accompanied by regular health and well-being inspections) [42], the United States has a legislative responsibility for all schools to have a wellness policy if they are participating in the national school lunch program [59] and Taiwan requires all schools to implement HPS [75]. Communication/marketing and fiscal policies were not explicitly described.
The most common intervention functions described by authors were enablement and environmental restructuring (Table 3). Various system-level resources and infrastructure supports were mentioned as being important to support enablement at the local level. These included personnel resources, structures, frameworks, tailored support with quality control, information and knowledge, financial resources and opportunities for collaboration and exchange [32,36]. Enablement was often combined with other intervention functions including environmental restructuring, education, training, modelling and incentivisation. The intervention functions persuasion and coercion were not identified in this review. Various studies discussed the importance of enablement through leadership between health and educational sectors to achieve a negotiated and shared vision for HPS as a joint initiative [32,45,57], tailored support with evidence and planning tools [47,48,62,69,72] and flexibility that allows for development based on the local needs of schools [32,42,68,69,72] (environmental restructuring). It was perceived that a balance between these conditions, that appreciates the need for "rigidity and flexibility" [51], would encourage ownership by schools to facilitate HP into practice and enhance sustainability [34,42,43,52,56,72]. Many studies also discussed the important role of a trained, effective coordinator to enable local planning groups to plan, implement and integrate HP [39,40,43,52,56,63,68,70]. External coordinators were perceived as being able to work across boundaries to garner support through partnerships, while also ensuring local progress and supporting evidence-based action as part of the school team through regular visits [37,45,61,71] (enablement). Various evidence and planning tools were used to support changes to the physical and social context of the school (enablement, education and environmental restructuring). For example, the SHI in the United States was used as a planning tool that facilitated collaboration and action planning for HP [61,62]. Other studies in Canada discussed the development of local surveillance systems that generated tailored products and reports provided opportunities for reflection, dialogue and action planning [49,53] and advocacy to accelerate investment [47] (enablement). In some cases, studies mentioned that a planning tool helped to embed HP policy and practice within the culture of the school system [53] (environmental restructuring). One study noted that there is a need for these tools to produce rapid results to identify strengths and areas of improvement [65]. Studies also commented on the importance of access to information to support HP and workshops/training sessions (education and training) to build knowledge and understanding of a HPS approach and their skills and confidence to take action [32,34,40,56,70].
Integration of a HPS approach within the core function of the school system was an important theme across the included studies as it incentivised schools to participate [52,76]. Ensuring the vision and aims of HPS were embedded with school mandates and responsibilities made it easier for teachers to participate [37] and helped to institutionalize HPS practices to ensure sustainability [32,34] and embed HP within accountability frameworks [36,51]. The compatibility of HPS with the education system was discussed in many studies as being an important incentive for schools and some studies mentioned this occurring through new national curricula [39,40,42] and policies [66]. If alignment was not achieved, studies reported many undesirable 'side-effects' [36] with professed lack of time and the busy school workload being a common barrier reported when HP was not well integrated into the system [36,39,41,61,66,71]. Studies also reported on the different types of incentives that were provided to encourage school participation, including financial resources through grants and provision of time for health promotion work through substitute coverage [32,34,37,39,41,51,52,61,66,71,72,74,76]. However, it is important to note that, one study mentioned that although having sufficient time was challenging, schools found ways to compensate [39]. Another study corroborated this finding by suggesting there was more of an emphasis on establishing partnerships rather than external support that may address the issue of time [40]. Collaboration and teamwork were also identified as being critical to facilitate the translation and integration of HP policy and practice [32,34,43,48,52,57,61,62,65,68,70,75,79]. Barnes and colleagues (2013) noted the importance of partnerships in helping to build organizational capacity to sustain the HPS approach [65].
Through collaboration, opportunities for exchange and learning with and from other schools (modelling) was discussed as being an opportunity to share best practices and enable HP [35,37,39,40,45,70]. Viig and colleagues suggested that rather than explicit training offered as a stand-alone session, ongoing professional learning was positively supported through providing opportunities for sharing and competence building within and across schools [37] (training and modelling). However, there were challenges to supporting this type of exchange, such as lack of resources [39] and collaboration, coordination and communication [35]. Engagement in and success of exchange opportunities in HPS generally may also be influenced by individual factors, such as teacher motivation, professional learning and discretion, or personal interest [38,41]. However, some studies suggest that, HP implementation levels, perceived HP impact and HPS efficacy of teachers are higher when there is increasing participation and system support [74,75].

Discussion
This review identified a range of articles describing interventions to support the uptake of the HPS approach across school systems. Bronfenbrenner's ecological model provided overall system context across multiple levels of influence [18] and the BCW provided a useful framework to describe the different intervention functions that have been used to implement a HPS approach [28]. There were various macrosystem influences across the studies that corresponded with the respective country or region. Many interventions were described at the exosystem level to provide different types of support for microsystems and some intervened to support interactions between microsystems (i.e., mesosystem). Service provision, guidelines and environmental/social planning were the most commonly represented BCW policy categories across the school systems included in this review. These policies provided high-level direction and resources within school jurisdictions that help to enable HP implementation through changes to schools social and physical environments. Communication/marketing strategies were not explicitly discussed in articles but there may have been national campaigns to promote and raise awareness of HPS that were not described. Fiscal policies were also not identified but considering that few countries reported legislative requirements, it is unlikely that any were using the tax system to reduce or increase costs. At the intervention function level of the BCW, there was a great deal of interaction described across elements. For example, although the most common main elements were enablement and environmental restructuring these were achieved in part by additional intervention functions including education, training, modelling and incentivisation. Environmental restructuring is consistent with the process of implementing a HPS approach as it requires a change to the physical and social context based on individual needs of school communities [5].

Ecological System Context
An ecological perspective supports the interpretation of the results and understanding how to support a HPS approach at a system-level. Previous studies have acknowledged that schools are social complex adaptive systems, considering their diversity and dynamic nature, nested system structure (i.e., various levels of jurisdiction and clusters), dependence and autonomy and the presence of rules, feedback loops and interaction [17,22,80]. Acceptance of this perspective assumes that interventions in schools require an appreciation of the interdependence between simultaneous and mutually interactive components and suggests that interventions may not always lead to predictable change within schools [17,22]. Rather, actions may results in non-linearity and emergence as education sector policies evolve and schools respond to the interaction between various factors [17,22,33]. Therefore, although different interventions may be needed to accommodate the unique contexts of schools, having adequate, appropriate and flexible support within the school system may enable schools to make autonomous decisions and implement HP practices based on their capacity and circumstances.
Contextual guidance has been described in the governance of complex social systems [81] and may provide a helpful strategy to consider support for HP adoption and implementation [33,42] as it combines internal self-organization (i.e., local decisions and control) and external strategic framing of options (i.e., providing a framework and resources). For example, providing the necessary resources and frameworks may help to ensure that schools have the support they need while fostering autonomy to implement according to their unique needs [42]. This perspective also highlights the importance of having HPS guidelines and supports available for schools while also moderating regulation as it may interfere with decision making and self-organization at the school-level [33,82]. The concept of linking and connecting schools to support modelling and exchange of diverse perspectives was also an important finding from this review [35]. Developing a learning organization and building a deeper understanding of the systemic change process can be critically important in achieving change [17]. Creating meaningful and relevant opportunities that facilitate collective visioning for alignment of a HPS approach with priorities of the education system may also help to engage all stakeholders in the change process to continuously learn and improve [17]. Evolving mindsets about education may help to shift perceptions of a HPS approach so that it is more fully integrated into the culture of schools [17,52]. Further research is needed to examine how to support organizational learning and foster understanding of change as it relates to a HPS approach.

Behaviour Change Wheel Components
This review identified potential interactions across the policy categories and intervention functions that were described in studies. Moderating regulation through a focus on enablement and supporting ownership of HP was an emphasis for many studies [34,42,43,51,52,56], whereas the BCW components of persuasion and coercion were not identified. This seems logical considering school ownership has been perceived as being critical to HPS sustainability [83]. The results from this review suggest that policy actions that develop HPS structures, matched with resources that build school-level action, can help to facilitate commitment to the HPS approach (e.g., through personnel resources, frameworks, tailored support with quality control, information and knowledge, financial resources and opportunities for collaboration and exchange). This is particularly important for facilitating HP actions in schools as many educators are trained to teach academic outcomes [6,84] and lack of guidance and resources for schools can limit their ability to embrace an HPS approach [34].

Strengths and Limitations
There are several strengths and limitations that should be noted. This review sought to identify the range of research on interventions designed to support the uptake of a HPS approach across school systems using scoping review methodology. This inclusive approach is a strength when considering such a complex topic. The two primary authors screened all potential articles according to the inclusion/exclusion criteria that were shaped using an iterative process. Key HPS content experts were consulted to identify relevant articles for the review. The focus was on peer-reviewed articles, and since a reasonable number of articles were identified, the results provide an important first step in scoping out the current evidence. Qualitative methods were used in the majority of included studies and although this provided depth to understanding potential implications of system supports, the impact of interventions were not always clear as few studies quantitatively evaluated the outcomes of system-level support. This is a limitation of the review as it precluded the ability to make direct comparisons across literature. Although evaluating impact was not the purpose of this review, it is important to note that several studies that included intervention outcomes found positive difference among changes to curriculum, social environment [38] and student well-being [78]. This scoping review also provides a first step in understanding how theoretical frameworks, such as the BCW and ecological model, may help to guide further interventions across HPS systems. An ecological model provides a framework to describe different system levels [18] and the BCW provides a mechanism to characterize interventions and match intervention types to the behavioural target, the target population and the context in which the intervention will be delivered [28]. For the BCW, there was limited information on the rationale for systems-level action (i.e., if decisions were politically motivated and/or based in tacit or empirical evidence) so it was unclear if they were designed with a formal process of mapping potential policies or interventions to have specific impacts on the schools. Future research could further apply this framework to explore how HPS interventions influence the behaviour system (capability, motivation, opportunity) of schools [28]. The results from this review also form the basis of further consultation with experts on the overall findings and identification of next steps, including the inclusion of grey literature to complement this review of peer reviewed studies. A systematic realist review of the literature is warranted to identify the types of intervention that work best for whom, in what circumstance, and how, to create healthier schools and students [85].

Conclusions
This review summarises research on interventions to support the uptake of a HPS approach across school systems. Despite international advocacy to support a HPS approach, there are persisting challenges that obstruct uptake of HP actions in school systems. Existing policies provide high-level direction and resources within school jurisdictions to support HP implementation. Various multifaceted organizational and professional interventions, including strategies to enable and restructure school environments through education, training, modelling and incentives were identified as important. Strategies that incentivised schools to implement HP were particularly relevant, considering the core responsibilities of schools are typically focused on academic rather than health outcomes. Top-down (macrosystem) system policies, sufficient support through interventions that enable school action (microsystem) through resources, information, planning supports and opportunities for sharing are required (exo-and mesosystem). Further review is needed to determine the combination of approaches that may help to redefine current challenges and establish an imperative for schools to promote health as a precursor to achieve improved learning outcomes, advance HP implementation and creating healthier schools and students.