Abstract
Play is critical to child development. In early childhood, object play evolves from exploratory behavior to complex symbolic play. Engagement during play, particularly joint engagement, is essential for learning and social interaction. Board Certified Behavior Analysts® (BCBAs) who provide early intervention services to young autistic children may experience barriers when designing programming and data collection systems for play and engagement. In this paper, we compare Naturalistic Developmental Behavioral Intervention (NDBI) and Natural Environment Teaching (NET) approaches. Considerations for measuring object play and engagement during naturalistic play routines are presented. We encourage BCBAs to consider simple frequency counts when measuring object play actions and interval recording or rating scales for tracking engagement states. These methods may better accommodate the variability in play and engagement behavior, allow for more flexible play routines, and support a more nuanced analysis of child progress.