This level of support focuses on improving specific skill deficits students have. Schools often provide Tier 2 supports to groups of students with similar targeted needs. Providing support to a group of students provides more opportunities for practice an feedback while keeping the intervention maximally efficient. Students may need some assessment to identify whether they need this level of support and which skills to address. Tier 2 supports help students develop the skills they need to benefit core programs at the school 

Source: Ohio PBIS Fact Sheet