Technology to Facilitate Progress Monitoring of Infant–Toddler Growth and Development: Measuring Implementation in Community-Based Agencies.

This article examines the implementation of Infant–Toddler Individual Growth and Development Indicators (IGDIs), a standardized progress monitoring system supported by a web application, across 10 community-based infant–toddler agencies. Using an Implementation Science framework, the study developed an Implementation Index to quantify agencies' progress through stages of Exploration, Installation, and Full Implementation, considering factors such as staff turnover and child-to-staff ratios. Findings indicate that high staff turnover and elevated child-to-staff ratios are associated with slower and less complete implementation, particularly during the Full Implementation stage, where ongoing assessment and data sharing tasks are most demanding. The Implementation Index differentiated agencies more effectively than simple completion rates, suggesting its utility for identifying programs needing additional support. The study highlights the challenges of sustaining evidence-based progress monitoring in infant–toddler settings and underscores the need for targeted implementation supports and further research on factors influencing fidelity and sustainability.