Griffin, T. L. C. (1983). Problem solving on maps - the importance of user strategies. Cartographic Journal, 20(2), 101-109.

An increasing proportion of cartographic research is directed at the responses of the map user, but little is known of the methods employed to arrive at those responses. Reports from test subjects required to solve a cartographic problem indicate that they had evolved a variety of strategies to assist them in task solution. The varying nature of those strategies is shown to have a pronounced impact upon the level of subject performance. It is suggested that knowledge of the methods devised by relatively inexperienced subjects to solve map problems should be of concern both to those involved in map design and in the instruction of map users.