Too often computer applications try to supplant rather than augment human capabilities. As a result, there is a gap between the power of the computer and some difficult administrative problems; e.g., longrange planning. However, there is increasing interest in the use of computer simulation in planning. PLANTRAN II represents a completely new approach away from former attempts to develop computer planning techniques. With this system, the decisionmakers can play an active role in the development of models with reduced dependence on technical staff. PLANTRAN II, which requires no technical expertise from the user, uses a simple language that is almost the same as the clerical instructions used in manual methods. This simple language is presented to a computer compiler that translates the instructions into computer terms. The instructions are processed by the computer, and the results are presented in a format set by the user. This manual contains information not only on the uses of the system but also on planning in general. It has a programed instruction set on the PLANTRAN II language. (Parts of pages 4-7 may reproduce poorly.) (Author/WM)