Disentangling Components of Flexibility via the Hexaflex Model: Development and Validation of the Multidimensional Psychological Flexibility Inventory (MPFI).

The current study developed the 60-item Multidimensional Psychological Flexibility Inventory (MPFI)-a scale assessing the 12 dimensions of the Hexaflex model. We created an exhaustive pool of 554 items including 22 of the most widely used measures from the acceptance and commitment therapy and mindfulness literatures. Exploratory and confirmatory factor analyses were used in combination with item response theory and responsiveness to change analyses in 3,040 online respondents across three studies ( NStudy 1 = 372; NStudy 2 = 2,150; NStudy 3 = 518) to create the MPFI. Associations between the MPFI subscales and an array of existing measures supported its convergent and discriminant validities. The MPFI offers acceptance and commitment therapy researchers new tools for elaborating treatment effects.

Internet administration of paper-and-pencil questionnaires used in couple research: assessing psychometric equivalence.

This study examined the psychometric equivalence of paper-and-pencil and Internet formats of key questionnaires used in couple research. Self-report questionnaires assessing interpersonal constructs (relationship satisfaction, communication/conflict management, partner support, emotional intimacy) and intrapersonal constructs (individual traits, psychological symptoms, contextual influences) were administered to young adults in committed dating relationships. The same measures were administered twice via paper-and-pencil and/or Internet methods over a 2-week period. Method order was counterbalanced among participants, and temporal stability was controlled. Intrapersonal and interpersonal measures generally remained reliable when administered online and demonstrated quantitative and qualitative equivalence across methods. The implications of online administration of questionnaires are discussed, and specific recommendations are made for researchers who wish to transition to online data collection.