Communities of Practice (CoPs) are a promising approach to facilitate the implementation of evidence-based practices (EBPs) to improve care for chronic conditions like heart failure (HF). COPs involve a complex process of acquiring and converting both explicit and tacit knowledge into clinical activities.Formation: In July 2006, a CoP called the Heart Failure Provider Network (HF Network) was established in the United States (US) Department of Veterans Affairs (VA) with the overarching goal of improving the quality of care for HF patients. The CoP has involved a total of 1,341 multidisciplinary and multilevel members at all 144 VA Health Care Systems (sites). Examples of CoP activities include discussions of interventions to decrease hospitalization rates and to empower patients and caregivers for self-management. Goals of the CoP include networking facilitation, information dissemination and exchange, collaboration and implementation of EBPs.Assessment: We conceptualized the assessment (formative evaluation) of the HF Network in terms of its various activities (inputs) and proximal impacts (mediators) at the individual-level, and its distal and ultimate impacts (outcomes) at the site-level leading to an improved culture of implementation of new/improved EBPs at the system-wide level.The HF Network membership grew steadily over the nine years. Most members were practicing clinicians (n=891, 66.4%), followed by administrators (n=342, 25.5%), researchers (n=70, 5.2%), and others (n=38, 2.8%). Participation was “active” for 70.9% versus “passive” for 29.4% of members. The distribution of active members (clinicians 64.7%, administrators 21.6%) was similar to the distribution of overall membership.Survey respondents perceived the HF Network as useful in terms of its varied activities and resources relevant for patient care. Members, particularly those that consider themselves influential in improving quality of care, noted multiple benefits of membership. These included confirmation of one’s own clinical practices, evidence-based changes to their practice and help in understanding facilitators and barriers in setting up or running HF clinics and other programs.