The purpose of this paper is to summarize the theoretical underpinnings and present the model analyses used in the development and evaluation of the Family Adaptation Model. Resilience theory, with its components of protective processes and vulnerability processes, underlies the assumptions of the model. Data analyses are presented from 2 samples in which survey methodology, post-test only experimental designs were implemented. There is moderate support for the linear dimensions of the model. When the paths predicted by the theory were tested, insignificant results were produced. Recent expert reviews of adaptation concepts and research approaches were used to explore the meaning of the null findings when testing the paths of the model in contrast to the success of the model when used to develop practice approaches with families.