PRISM Project: Precision in Reflective Supervision Measurement - The Precision in Reflective Supervision Measurement (PRISM) project is a multisite, longitudinal study designed to strengthen the evidence base for measuring reflective supervision in the early childhood home visiting workforce. PRISM will rigorously evaluate the recently developed Supervisor Practices in Reflective Supervision-Home Visiting (SuPRS-HV) measure by validating it against an independent observational tool. Furthermore, the study will identify the specific configurations of individual, supervisory, and relational conditions that successfully foster reflective capacity among home visitors. The home visiting workforce engages directly with families navigating complex dynamics, including cumulative trauma, domestic violence, and chronic economic strain. Managing these challenges exposes home visitors to emotional exhaustion, secondary traumatic stress, and burnout, which frequently leads to high staff turnover. While reflective supervision serves as an essential strategy to alleviate this stress and build clinical skills, there are persistent gaps in how it is measured. This study addresses the need to further validate the SuPRS-HV measure for use across multiple sessions and will sample a diverse population of approximately 36 supervisors and 108 home visitors operating across urban, suburban, rural, and high-poverty regions in six jurisdictions: Washington, DC, Arkansas, Indiana, Wisconsin, Connecticut, and Massachusetts. As a research and evaluation initiative, PRISM will implement a structured, multi-cohort data collection protocol over a seven-month period. Research activities include collecting supervisor-reported SuPRS-HV data, home visitor surveys, and conducting independent observational coding of reflective supervision sessions using the Reflective Interaction Observation Scale (RIOS) and assessment of home visitors' reflective capacity using the Provider Reflective Process Assessment Scale (PRPAS). In addition to research execution, the project will provide participating programs with foundational books on reflective supervision, customized aggregate data dashboards for continuous quality improvement, and co-designed practical toolkits. PRISM has three primary objectives: 1. What is the concurrent validity of SuPRS-HV scores when compared against independently coded observational scores from the RIOS and home visitors' self-reported scores on the Reflective Supervision Rating Scale (RSRS)? 2. How many session-level SuPRS-HV administrations are needed to obtain a dependable estimate of an individual supervisor's reflective supervision practices? 3. What combination of individual (baseline reflective capacity), supervisory (consistency in the quality of supervision, supervisors' years of experience), and relational (duration of supervisor-home visitor relationship) conditions make a difference in home visitors' reflective capacity?