Acceptance and commitment therapy (ACT, typically pronounced as the word "act") is a form of psychotherapy, as well as a branch of clinical behavior analysis. It is an empirically based psychological intervention that uses acceptance and mindfulness strategies along with commitment and behavior-change strategies to increase psychological flexibility. This approach was originally termed comprehensive distancing. Steven C. Hayes developed the treatment starting around 1982 in order to create an approach that integrated both key features of cognitive therapy and behavior analysis, especially behavior analytic data on the often negative effects of verbal rules and how they might be ameliorated. There are a variety of protocols for ACT, depending on the target behavior and setting. For example, in behavioral health areas, a brief version of ACT is called focused acceptance and commitment therapy (FACT). The objective of ACT is not elimination of difficult feelings; rather, it is to be present with what life brings and to "move toward valued behavior". Acceptance and commitment therapy invites people to open up to unpleasant feelings, learn not to overreact to them, and not avoid situations where they are invoked. Its therapeutic effect aims to be a positive spiral where a greater understanding of one's emotions leads to a better understanding of the truth. In ACT, "truth" is measured through the concept of "workability", or what works to take another step toward what matters (e.g., values, meaning). Technique Basics ACT is developed within a pragmatic philosophy called functional contextualism. ACT is based on relational frame theory (RFT), a comprehensive theory of language and cognition that is derived from behavior analysis. Both ACT and RFT are based on B. F. Skinner's philosophy of radical behaviorism. ACT differs from some other kinds of cognitive behavioral therapy (CBT) in that rather than trying to teach people to better control their thoughts, feelings, sensations, memories and other private events, ACT teaches them to "just notice," accept, and embrace their private events, especially previously unwanted ones. ACT helps the individual get in contact with a transcendent sense of self known as self-as-context—the you who is always there observing and experiencing and yet distinct from one's thoughts, feelings, sensations, and memories. ACT aims to help the individual clarify their personal values and to take action on them, bringing more vitality and meaning to their life in the process, increasing their psychological flexibility. While Western psychology has typically operated under the "healthy