Which theories contain limited numbers of concepts and are limited in scope with some degree of generalization, but the concepts are clear and hypotheses can be derived?

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Middle range theories are characterized by a limited number of concepts, are limited in scope, allow for some degree of generalization, and have clear concepts from which hypotheses can be derived. They bridge the gap between grand theories, which are broad and complex, and empirical observations, providing a more focused and testable framework for research and practice.

Which Theories Contain Limited Numbers of Concepts and Are Limited