CITY III is a computer-assisted simulation game in which participants make decisions affecting the economic, governmental, and social conditions of a simulated urban area. In one of its five city options (called Lothian) the CITY III simulation model focuses on a micro-view of an urban area by reducing the level of aggregation. The population is reduced ten times so that each population unit equals 50 persons (instead of 500) and each unit of linear measure equals one-third of a mile (instead of a mile). The numerical parameters for each decision-making sector in this small scale version are presented in the form of a set of "Master Sheets" and input explanation charts. The "Master Sheets" and charts for the other four versions are contained in the Players' Manual. (JY)