C.40:2 - Problem

Search can become an inventory of interesting possibilities without any performed development. It can also discard everything that loses today’s comparison, including material that makes a useful next attempt possible.

The opposite excess is endless novelty or indiscriminate retention. A changed object, a higher score or success in a source problem does not by itself justify more work. Productive branching needs feasible operations, examination under the current question and an affordable continuation. Coupled search additionally needs validly constructed problems and target-tested transfer.