Building on interdependence theory, Caryl Rusbult created the investment model of commitment in the 1980s. Her model predicts that relationship commitment and stability are based on three factors: relationship satisfaction, alternatives, and investments. Decades of research studies building on this model have supported these predictions, often through the self-report survey she and her colleagues created to measure each component. In the last several years, important applications and extensions of the model have provided further evidence of its utility in relationship science.