Final answer:
Problem solving is the process used when a gap is perceived between an existing state and a desired state. It involves identifying the given information and applying problem-solving strategies to find a solution.
Step-by-step explanation:
Problem solving is the process used when a gap is perceived between an existing state and a desired state. It involves identifying the given information and what the problem is asking you to find. Then, different problem-solving strategies can be applied to find a solution. For example, in the case of the locked doorway scenario mentioned, the person needed to shift their mental set and try a different approach to solve the problem.