ACT is a contextually focused form of cognitive behavioral psychotherapy that uses mindfulness and behavioral activation to increase a client’s psychological flexibility—their ability to engage in values-based, positive behaviors while experiencing difficult thoughts, emotions, or sensations. ACT establishes this through six core processes: Acceptance of private experiences; cognitive defusion (i.e., alter the undesirable functions of thoughts and other private events); being present, a perspective-taking sense of self; identification of values; and commitment to action. The first four processes define the ACT approach to mindfulness, and the last two define the ACT approach to behavioral activation. ACT is delivered to clients in one-on-one sessions, in small groups or larger workshops, or in books or other media, through the presentation of information, dialogue, and the use of metaphors, visualization exercises, and behavioral homework. The number, frequency, and length of the sessions and overall duration of the intervention can vary depending on the needs of the client or treatment provider.