Measuring components of the investment model by Rusbult

According to Rusbult's investment model (1980), the dynamic and stability of close relationships can be predicted by commitment. Commitment increases with individuals' relationship satisfaction and investments, and decreases with quality of alternatives. A German version of the investment model scale (Rusbult, Martz & Agnew, 1998) measuring the four basic components of the model was constructed and tested in two studies. Study 1 (N= 173) investigated the factor structure, reliabilities and intercorrelations of the four scales. Study 2 (N= 100) assessed the convergent and discriminant validity on the basis of intercorrelations of the four scales with various external criteria. The studies revealed good reliability and validity of the scales.