INS, the Integrated Network Simulation language, puts simulation modeling into a network framework and automatically performs such programming activities as placing the problem into a next event structure, coding events, collecting statistics, monitoring status, and formatting reports. To do this, INS provides a set of symbols (nodes and branches) corresponding to familiar processes such as queues and activities which can be combined to create a network model of a system such as health care, manufacturing, and computer systems. The resulting network provides an excellent means of communicating the structure of the system to other people. The modeler translates the INS network into INS statements which are then read and executed by INS. INS automatically provides comprehensive statistical output on the behavior of the model. Based on the output, the original model can easily be altered and extended. Furthermore, experiments can be conducted in which characteristics of the network are changed. The result of these experiments can then be used to make predictions about the effects of making similar changes to the system being studied. INS is powerful yet easy to use and teach and requires no prior knowledge of simulation or programming. A textbook on INS, written in standard FORTRAN for portability, is available. (Author/JEG)