The development of guidance design procedures for the evaluation of geosynthetic materials used in containment systems for landfills, surface impoundments and waste piles has been computerized to increase the speed of calculation of results and to reduce the frequency of human error resulting from manual calculations. A summary of the test procedures used in evaluating each specific material property is provided in the manual. Relevant standards for each test are referenced when available. Software Description: The software is written in Advanced Basic for implementation on IBM-PC or compatible machines using the DOS operating system. Memory requirement is 256 Kbytes. Special features/requirements: An 8086 microprocessor; one 5 1/4 inch diskette drive with controller; a detached keyboard; and a printer with an adapter board. A color/graphics adapter with suitable monitor is required to display GM System graphics.