Two new systems of adult outpatient psychotherapy based on Skinner's r
adical behaviorism are described. They do not resemble traditional beh
avior therapy. Functional analytic psychotherapy (FAP) relies on an in
volved, emotional, nonmanipulative client-therapist relationship as th
e vehicle of change. Acceptance and commitment therapy (ACT) gives the
client a counterintuitive method of accepting, rather than changing o
r eliminating, troublesome thoughts and feelings. The descriptions of
these therapies are offered (a) to illustrate how intensive, in-depth
psychotherapies can be derived from radical behaviorism, and (b) to ci
rcumvent the frequent misunderstandings that characterize the discussi
ons between behavior analysis and their critics. The nature of ACT and
FAP methods appears to dispel many common myths about contemporary be
havior analysis.