Editing Trial and error (section)

==Features==
Trial and error has a number of features:
*solution-oriented: trial and error makes no attempt to discover ''why'' a solution works, merely that it ''is'' a solution.
*problem-specific: trial and error makes no attempt to generalize a solution to other problems.
*non-optimal: trial and error is generally an attempt to find ''a'' solution, not ''all'' solutions, and not the ''best'' solution.
*needs little knowledge: trials and error can proceed where there is little or no knowledge of the subject.

It is possible to use trial and error to find all solutions or the best solution, when a testably finite number of possible solutions exist. To find all solutions, one simply makes a note and continues, rather than ending the process, when a solution is found, until all solutions have been tried. To find the best solution, one finds all solutions by the method just described and then comparatively evaluates them based upon some predefined set of criteria, the existence of which is a condition for the possibility of finding a best solution. (Also, when only one solution can exist, as in assembling a jigsaw puzzle, then any solution found is the only solution and so is necessarily the best.)