The purpose of this paper is to document and describe a computer program which simulates the impact of alternative dairy policies and technologies on important dairy market variables such as farm and retail prices and quantities. Several policy and technology scenarios are simulated to illustrate the output of the program. The model, which is called the National Economic Milk Policy Impact Simulator (NEMPIS), is general in specifications of the duration of the simulation period, policy instruments, and technological choices. The computer software is available to anyone, provided that they send the author an IBM compatible formatted floppy disk. The model should be of interest to economists, policy makers, and dairy scientists interested in analyzing farm and retail market impacts due to federal policies and/or alternative technologies