“…First, experiential avoidance, a core theorized ACT target process, should be measured using instruments that do not conflate experiential avoidance with negative affect and distress, a criticism of the most widely used ACT process measure (Tyndall et al, 2019;Wolgast, 2014), the Acceptance and Action Questionnaire-II (AAQ-II; Bond et al, 2011). In addition, if the AAQ-II is used, then versions that probe experiential avoidance in specific relevant contexts may yield more accurate estimates of behavior (Ong et al, 2020). Second, given psychometric problems with other common measures of core theorized ACT target processes, such as measures of values-aligned behavior (Reilly et al, 2019), researchers should consider using multiple instruments of the same target process, probing the construct in different ways.…”