Abstract
Many studies of self-report psychological scales have been conducted in the area of cognitive behavior therapy, including in psychological and medical fields. The current situation is that too many duplicative constructs have been created, and many studies do not have adequate methodological quality; this has led to a lack of information necessary for clinical practice and further research. To change this prevailing situation, the COSMIN (COnsensus-based Standards for the selection of health Measurement INstruments) checklist was developed, based on various fields of research, but focusing on health measurement. In order to plan a successful research plan, the present article first introduces a brief overview of the COSMIN checklist. Next, 4 important issues are explained: (a) planning sample size, (b) evaluating test-retest reliability and measurement error, (c) hypothesis testing, and (d) evaluating responsiveness and interpretability. How these issue comply with the COSMIN checklist is indicated, alongside concrete examples of writing a research report.
