ABSTRACT
As mentioned in Chapter 1, some types of problems can be solved by following a clear and complete set of rules that will allow you, in principle, to get from the situation described at the start of the problem (the initial state) to the goal. Many of them are also knowledge-lean; that is, very little domain knowledge is needed to solve them. It was also pointed out that such problems are rare in everyday life, yet these are the types of problems that information-processing psychologists have spent a lot of time studying in the past. So why study them?
