Functional analytic psychotherapy is based on a functional analysis of the therapeutic relationship.[12] It places a greater emphasis on the therapeutic context and returns to the use of in-session reinforcement.[13] The basic FAP analysis utilizes what is called the clinically relevant behavior (CRB1), which is the client's presenting problem as presented in-session. Client in-session actions that improve their CRB1s are referred to as CRB2s. Client statements, or verbal behavior, about CRBs are referred to as CRB3s.