Feasibility, reliability and validity of a modified approach to goal attainment scaling to measure goal outcomes following cognitive remediation in a residential substance use disorder rehabilitation setting.

Objective: Although person-centred outcome measures have been recommended to evaluate cognitive rehabilitation interventions, few validated measures have been developed for this purpose. The current study examined aspects of feasibility, reliability and validity of a modified version of goal attainment scaling that uses a goal menu, calculator and control goals. Method: Participants were N=25 female residents of a substance use disorder therapeutic community who were allocated to a four-week cognitive remediation (n=13) or treatment as usual (n=12) control group in a controlled sequential groups trial. Modified goal attainment scaling was used to set goals. Limited efficacy and efficiency, quality appraisal criteria, and convergent and discriminant validity of target and control goals were used to examine feasibility, reliability and content validity, and construct validity, respectively. Results: Target goals were achieved at a higher rate than control goals for the Intervention, but not Control, group, with a medium effect size (r = 0.5). The approach was efficient and 44% of reliability and 75% of content validity criteria were met. Target goals correlated more strongly than control goals with the Behavior Rating Inventory of Executive Function - Adult version. Conclusions: The modified approach to goal attainment scaling demonstrated aspects of feasibility, reliability and validity.