Abstract
The purpose of the article is to emphasize why social-psychological be practical for both theory and practice. As investigators attempt to which theories are most parsimonious, there is often encouragement to pit against each other rather than also examining their similarities and their mentary nature. The former strategy may lead to fragmentation of illustrate the benefit of the latter strategy, the theories of selfe5cacy, action, and planned behavior are discussed relative to practical good theories and their conceptual and measurement similarities. This is extended intojoint use considerations for planning practical signed to impact on health and exercise behavior. It is suggested that such ventions have more potential to induce health/exercise change than any theory. The appropriateness of using these practical theories to study adherence isdiscussed. Lewin's (195 1) point about there being nothing so as a good theory for applied research and intervention is the underlying of the article.