(1) locating a map of the are, (2) identifying on the map alternative routes to the city, and (3) comparing the desirability of the various routes by testing the alternatives against a series of criteria, including those of distance to distance to travel, road conditions, amount of traffic, safety, attractiveness of the scenery, and others. As strolls along the street under the influence of this “mental set,” she scans the environment for sources of road maps. Her visual attention is caught by a agency sign on a store window. For this girl at this moment, that particular sign is a “salient stimulus” in the environment because one of the relationships she has stored in long-term memory (travel agency+maps and road information). Her decision to enter the agency ( a decisicn reached in semantic short-term memory) evokes from long-term memory sequences of operation that cause her efferent nerve to order the muscular movement that allow her to walk into the shop.