Addressing the construct validity of the “individual problems and strengths” scale

Abstract

Background: Routine Outcome Monitoring (ROM) systems have been used to monitor how a client’s life changes over the course of therapy. However, if a ROM system is to be used, the system should have sufficient construct validity to warrant its usage. In the current study we sought to test the construct of the “individual problems and strengths” (IPS) measurement scale, a sub-section of the “Systemic Therapy Inventory of Change” (STIC). Methods: We used a factorial construct validation procedure utilizing a stepwise confirmatory factor analysis approach on a sample of 841 clients of couple and family therapy. Results: We found support for the original “8-factor” version of the IPS but failed to find support for the “1-factor” version and the “higher order factor structure”. Conclusions: The investigation uncovered that the measurement tool is still under development and since the factorial construct (and the scale-reliability) was only supported for the original "8-factor" model, we encourage a pause in administering the IPS in clinical practice.