The purpose of this study was to document within-year fidelity growth
during installation and initial implementation of School-Wide Positive
Behavioral Interventions and Supports (SWPBIS). Participants included school
teams from schools throughout the United States that were in years one to four
of SWPBIS implementation and routinely evaluated their implementation fidelity.
The fidelity outcome was assessed with the Team Implementation Checklist (TIC)
and was completed multiple times per year by SWPBIS teams. Results from
multilevel fidelity growth models documented within- and between-school
variability and growth predictors. Years implementing, location, school type and
enrollment size were significant predictors of beginning year fidelity scores
(intercept), and years implementing and relative socio-economic status were
significant predictors of the average rate of fidelity change per month of
school (slope). These results add to the growing field of implementation
science, and practice recommendations are outlined.