Quantum mechanics

Test validity

Acceptance and commitment therapy

Experiential avoidance

Construct (python library)

Discriminant validity

Psychiatry

Power (physics)

Computer science

Anxiety

Psychometrics

Cronbach's alpha

Physics

Construct validity

Psychology

Reliability (semiconductor)

Intervention (counseling)

Programming language

Clinical psychology

Internal consistency

Behavior Therapy

The present research describes the development and psychometric evaluation of a second version of the Acceptance and Action Questionnaire (AAQ-II), which assesses the construct referred to as, variously, acceptance, experiential avoidance, and psychological inflexibility. Results from 2,816 participants across six samples indicate the satisfactory structure, reliability, and validity of this measure. For example, the mean alpha coefficient is .84 (.78–.88), and the 3- and 12-month test–retest reliability is .81 and .79, respectively. Results indicate that AAQ-II scores concurrently, longitudinally, and incrementally predict a range of outcomes, from mental health to work absence rates, that are consistent with its underlying theory. The AAQ-II also demonstrates appropriate discriminant validity. The AAQ-II appears to measure the same concept as the AAQ-I (r = .97) but with better psychometric consistency.

Preliminary Psychometric Properties of the Acceptance and Action Questionnaire–II: A Revised Measure of Psychological Inflexibility and Experiential Avoidance