Expertise development refers to the process through which individuals acquire a high level of knowledge and skill in a specific area through experience, practice, and education. This process is often characterized by the transition from novice to expert, marked by the deepening of understanding and proficiency over time. Expertise development also emphasizes the role of metacognitive skills and the ability to adapt one's strategies to solve complex problems, which is particularly relevant in the context of cognitive development and post-formal thought.