Evaluating Process of Change in Cognitive Behavioral Therapy and Acceptance and Commitment Therapy for Depression

The GAD-7 (Spitzer et al., 2006) is a seven-item self-report measure of anxiety symptom severity.

The WHOQOL-BREF (WHOQOL Group; 1998) is a 26-item self-report measure that evaluates four dimensions of quality of life (physical health, psychological health, social relationships, environment. Each item ranges from 1-5 and items are summed upon completing the measure. Higher scores indicate greater satisfaction with quality of life.

The PANAS (Watson et al., 1988) is a 20-item scale that assesses the extent to which participants are experiencing different positive and negative emotions in the present moment. 10-items assess positive emotions and 10-items assess negative emotions. Items range from 1-5 and are summed based on the valence of the emotion. Higher scores indicate more salient experiences of affect.

The PHQ-9 (Kroenke et al., 2001) is a 9-item self-report scale that measures depressive symptom severity. Each item ranges from 0-3 and items are summed upon completing the measures. Higher scores indicate greater depression symptom severity.

The DRVS (Williams, unpublished; and first published by Clark et al., 2006) is a 6-item measure of heightened vigilance in response to experiences of racial discrimination. This scale will be asked as a follow-up to the Brief PEDQ- CV to assess the extent to which the client is vigilant in their surroundings because of previous discrimination they experienced.

The VQ (Smout et al., 2014) is a 10-item self-report measure that assesses the extent of personal values enactment during the past week.

The ATQ (adapted from Hollon \& Kendall, 1980) is a 30- item self-report checklist measure of common automatic thoughts participants may or may not have experienced in the past two weeks.

The ERQ (Gross \& John, 2003) is a 10-item self-report measure of two emotion regulation strategies, cognitive reappraisal and expressive suppression.

The PVSS-21 (Khazanov et al,. 2020 ) is a self-report scale assessing the National Institute of Mental Health Research Domain Criteria Positive Valence Systems constructs (e.g., reward anticipation and initial reward responsiveness).

The MSPSS (Zimet et al., 1988) is a 12-item measure of perceived adequacy of social support from family, friends, and significant others.

The GSRS (Quirk et al., 2013) is a client-reported measure that assesses alliance, the quality of individual sessions, and helper skills.

The DUACRS (McGrath, 2012) is a therapist-reported measure designed to assess adherence to CBT and ACT treatment components. While the original measure was designed to assess the extent to which each of these components occurred at every 5-minute interval during a session, we slightly adapted the response options to indicate whether the treatment components occurred at all in the relevant session.

The CALPAS-G-TV (Gaston \& Marmar, 1994) is a therapist- report measure of the therapeutic alliance in group psychotherapy settings.

The CGI (Guy, 1976) is a standard therapist-reported measure for making global assessments of clients' illness and improvement.

The ChaCha-EMA consists of the same items assessed in the ChaCha-TD with the exception that questions will be phrased to assess clients' experiences at the moment of survey completion.