DeLand, L., Strongin, D. L., Schwartz, R. C. (2004) The Development of a Personality Scale Based on the Internal Family Systems Model. Journal of Self Leadership, 2(1), 1-14.
Abstract: The purpose of this study was to develop a new measure based on the Internal Family Systems (IFS) model that would be useful for clinical and research purposes. Adults from a variety of settings (N = 1174) volunteered to rate how frequently they experienced various thoughts and feelings on a self-report questionnaire. Cronbach’s alpha, Pearson product-moment correlations, partial correlations, and factor analysis were used to examine the internal reliability and construct validity of the scale. A 57-item IFS Scale with 10 subscales and a 25-item Self Scale were developed. Both of the measures were found to have adequate internal reliability and to reflect meaningful group differences consistent with IFS theory.
This article describes the development of the IFS SCALE in the language of a mythical quest.