Developed over decades of ongoing clinical research, acceptance-based behavioral therapy (ABBT) is a flexible framework with proven effectiveness for treating anxiety disorders and co-occurring problems. This authoritative guide provides a complete overview of ABBT along with practical guidelines for assessment, case formulation, and individualized intervention. Clinicians learn powerful ways to help clients reduce experiential avoidance; cultivate acceptance, self-compassion, and mindful awareness; and increase engagement in personally meaningful behaviors. Illustrated with vivid case material, the book includes 29 reproducible handouts and forms. Purchasers get access to a companion website where they can download printable copies of the reproducible materials and audio recordings of guided meditation practices. A separate website for clients includes the audio recordings only.