For questions related to the (automated) planning problem, which is the problem of finding a plan, i.e. a sequence of actions to move from an initial state to a goal state or a policy (a function from states to actions), and planning algorithms. There are different ways to define a planning problem (such as PDDL) and solve a planning problem (e.g. GraphPlan). In reinforcement learning, planning consists in finding a policy that solves an MDP.