Introduction: The Centre for Integrated Care (CIC), situated within St. Joseph's Health System in Ontario, is an innovation centre committed to research, education and evaluation to support advancement of integrated care across Canada. The CIC supports internal and external organizations to inform the design and implementation of innovative integrated care programs. Learnings from this work began in 2010 and have informed the development of a maturity model for integrated care. Maturity models are tools for organizations to assess effectiveness and help determine next steps to improve performance. Organizations may use this tool to assess their own processes and identify requirements to reach the next level of maturity of integrated care. Aims, Objectives, Theory or Methods: The objective of this project was to develop a practical hands-on resource for organizations of any size, at any point in their implementation journey to understand critical signposts to move forward in maturity of integrated care. To develop the maturity model, the project team, including patient partners, built on key learnings from a decadelong journey of working with different stakeholders to advance integrated care. We reviewed relevant academic and grey literature to identify prior work in this area and sought partnerships with people with lived or worked experience, including patients and carers, providers, managers, researchers and policy-makers throughout the maturity model development. We continue to seek partnerships and engagement as we refine the model and associated resources to ensure that it is relevant, appropriate, acceptable and practical for stakeholders within the health and social care system. Highlights or Results or Key Findings: We gathered a library of articles, tools, and standards describing the key elements of integrated care and synthesized this information and identified gaps in the practical applicability of existing resources to create an easy-to-use tool that represents different perspectives and is digitally available. This tool is not limited by scope or breadth of ambition, but supports providers, programs and organizations to assess and advance integration within the constraints of their context. Six domains were identified: patient population; evidenceinformed care pathways; access and equity; people and teams; governance and funding; and data systems and evaluation. A unique component of our model is the introduction of different versions of the questionnaires used to obtain insight from multiple perspectives, including clients/patients and families, community members, providers, organization/program leaders, and health and social care system administrators and planners. This allows organizations to assess maturity from multiple perspectives and encourage deeper conversations where perspectives may diverge. Conclusions: A maturity model for integrated care provides an engaging way for programs and organizations to self-assess and identify where their organization fits along a continuum of maturity. They will be empowered to determine next steps and uncover 'accelerators' to advance their implementation of integrated care. Implications: The maturity model tool has broad utility for programs and organizations of various sizes and scopes. Examples of use include readiness assessment for implementation, spread and scale, outcome measurement to evaluate change in maturity of integration, or for benchmarking and comparison purposes. [ABSTRACT FROM AUTHOR]