Even when schools are implementing Tier 1 systems and practices with high fidelity, some students need more targeted and systematic support. Tier 2 practices provide students with an additional layer of rapid and efficient behavior support. However, school teams will need to regularly measure the fidelity of both core features of these Tier 2 practices and the Tier 2 systems supporting those practices. This brief describes the core features of Tier 2 systems and practices and provides examples of researcher-developed measures used to assess them.