What is a signed, written agreement between two or more parties to perform some action?

A signed, written agreement between two or more parties to perform some action is best defined as a contract. A contract is a legally binding document that outlines the responsibilities, obligations, and rights of each party involved in the agreement. It is crucial in ensuring that all parties understand the terms of the action to be performed and provides a framework for enforcement in case of a dispute.

In contrast, a covenant is often associated with promises to do or not do something, typically found in religious or moral contexts, rather than purely legal agreements. An agreement may refer to a broader understanding between parties but does not necessarily imply the formal or legal obligations that a contract entails. A policies document typically outlines guidelines or procedures and does not constitute a binding agreement to perform specific actions. In this context, the precise formal nature of a contract makes it the most accurate answer to describe a signed, written agreement to perform actions.