The Ashridge Mission Model is a strategic management tool that helps organizations define and communicate their mission statement. It was developed in the 1980s by the Ashridge Strategic Management Centre, a research institute at Ashridge Business School in the United Kingdom.

The model consists of four elements:

1. Purpose: The reason for the organization's existence, beyond just making a profit.
   
   
2. Strategy: The approach the organization takes to achieve its purpose.
   
   
3. Values: The principles and beliefs that guide the behavior and decision-making of the organization.
   
   
4. Behavior: The actions and practices that reflect the organization's purpose, strategy, and values.
   

The model suggests that the four elements are interdependent and should be aligned with each other to create a cohesive and effective mission statement. By defining and communicating a clear mission statement, an organization can better align its actions and decisions with its goals and values, which can ultimately lead to greater success and fulfillment of its purpose.