WhyTry in RTI and PBIS Models Tier 3 WhyTry is implemented in an individual setting. Services are provided by a school social worker, counselor, psychologist, administrator, or outside agencies. Tier 2 WhyTry is implemented in a small group setting or a specialized classroom. Tier 1 WhyTry is implemented in a classroom or school-wide setting. Services are provided to all students by all educators. Assessments