Experts organize their knowledge in problem schemas that include relevant information about a type of problem and the procedures for solving problems of that type.
You have a problem when your current situation differs from your desired goal.
You want to be rich, but your checking account balance is circling the drain.
To examine how problem solving develops over time, the researchers had participants solve a series of matchstick problems while verbalizing their problem-solving thought process.
The findings from this second experiment showed that people tend to go through two different stages when solving a series of problems.