Determining the acceptability of the program among participants and facilitators via questionnaires about their experience in the program.

(1) assessing therapist adherence to ACT-PM intervention via self-report from therapists and (2) independent rater review of 10% of audio tapes of sessions using ACT-FM (The ACT Fidelity Measure)

Tracking number of participants who completed data collection measures (i.e.. acceptability questionnaire, and clinical scales - described below)

Premenstrual Symptoms Screening Tool (PSST) is a validated questionnaire which consists of 19 questions regarding how symptoms interfere with relationships and daily activities -14 questions are related to premenstrual symptoms, and 5 questions that measure the severity of interference of the symptoms on a woman's ability to function. The scale of each item ranges 0-3: not at all (0); mild (1); moderate (2); severe (3). Higher scores indicate a worse outcome.

9-item assessment for depression, with scores indicating how often symptoms are bothersome, ranging from 0 (not at all) to 3 (nearly every day). Higher scores indicate a worse outcome.

The GAD-7 a 7-item well-validated self-report scale which can aid in diagnosis and severity assessment for anxiety disorders (including GAD, social anxiety disorder, post-traumatic stress disorder, panic disorder). It is sensitive to change across treatment. Score ranges are from 0-21, with scores of 0-4 representing minimal, 5-9 mild, 10-14 moderate, and 15-21 severe anxiety symptoms.

The AAQ-II is a 7-item self-report scale that assesses constructs relating to acceptance, experiential avoidance, and psychological inflexibility, which are targets of Acceptance and Commitment Therapy (ACT). It has demonstrated satisfactory reliability and validity, has been validated in psychiatric populations, and scores are predictive of mental health and functional outcomes. Higher scores indicate less (worse) flexibility.

The MAAS is a 15-item self-report scale-used previously in both ACT and PMS research-to assess components of mindfulness such as present-moment awareness and observing capacity, which are considered transdiagnostic processes underlying various forms of psychopathology. Higher scores indicate less mindfulness (worse).

The VQ is a 10-item self-report measure that was developed to assess changes in a target of ACT-valued living. Its' 2 subscales are correlated strongly with measures of emotional/affective symptoms and life satisfaction. In scoring, higher scores on the Progress scale are associated with health, as are lower scores on the Obstruction scale.

The ERQ is a 10-item self-report measure designed to assess individuals' tendency to regulate their emotions through Cognitive Reappraisal and Expressive Suppression. Emotion regulation is a target in ACT therapy. To score the ERQ, the average of the scores in each subscale - (i) cognitive reappraisal and (ii) expressive suppression are taken. The higher the score, the greater the use of that particular emotion regulation strategy - cognitive reappraisal is considered adaptive (thus higher scores are better) and expressive suppression maladaptive (lower scores are better).