The McKinsey 7-S model is a framework for understanding how an organization operates. It identifies 7 internal elements - strategy, structure, systems, shared values, style, staff, and skills - that influence organizational effectiveness. These elements are interdependent and can be classified as "hard" (strategy, structure, systems) which are more tangible, or "soft" (shared values, style, staff, skills) which are less tangible. The model aims to show how changes in one element can impact the others and examines the fit between the elements. It provides a checklist to assess an organization's readiness for change and identify strengths and weaknesses.