Name and describe the three types of problems identified by Greeno (1978)and indicate which of the six approaches to problem solving discussed in your text would be helpful and unhelpful in solving each type of problem.

 Problems of inducing structure: The subject must discover the relations among the parts of the problem.Examples include series-completion problems and analogy problems.Working backward can't be applied since the goal state is unknown.It would be helpful to form subgoals.For instance,to solve analogy problems,the first subgoal is to figure out all the possible relations between the first two parts of the analogy.
Problems of arrangement: The subject must arrange the parts of a problem in a way that satisfies some criterion (although the specific goal state is not known).These are generally solved in a flash of insight after a period of trial and error.Anagrams are an example of this type of problem.Trial and error might be effective if the number of possible solutions is small.Working backward,particularly if there are relatively few goal states,might be helpful.Changing the representation of the problem may help overcome mental set or functional fixedness.
Problems of transformation: The subject must carry out a sequence of transformations in order to reach a specific goal.These problems are generally solved by carrying out a sequence of planned steps.