"The purpose of the SWPBIS Tiered Fidelity Inventory (TFI) is to provide a valid, reliable, and efficient measure of the extent to which school personnel are applying the core features of school-wide positive behavioral interventions and supports (SWPBIS). The TFI is divided into three sections (Tier 1: Universal SWPBIS Features; Tier 2: Targeted SWPBIS Features; and, Tier 3: Intensive SWPBIS Features) that can be used separately or in combination to assess the extent to which core features are in place". (Algozzine, B., Barrett, S., Eber, L., et. al., (2019). School-wide PBIS Tiered Fidelity Inventory. OSEP Technical Assistance Center on Positive Behavioral Interventions and Supports).