aka contingency plan, policy, or strategy.
A course of action that explicitly handles the uncertainties arising from partial observability and Non-deterministic Actions.
Unlike a simple sequence of actions (a straight-line plan), a conditional plan is a structure (e.g. tree/graph) that includes conditional branches based on the observations the agent receives during execution.
It maps possible observations (or the resulting belief states) to subsequent actions. The plan specifies what action to take for every possible outcome of an action/observation step.
The goal of the search process is to find an optimal conditional plan