Trial-and-error procedure for solving problems (or reaching an unclear goal) through incremental exploration, and by employing a known criteria to unknown factors. For example, trying to climb a fog shrouded hill by making every step an upward-step. In journalism, a well known heuristic is asking Who? What? When? Where? Why? in investigating a news story. A heuristic employs independent discovery, and relies heavily on common sense,creativity, and learning from experience. Unlike an algorithm, however, it offersno guarantee of solving any problem.