XLCOTSIM is a simulator package that is embedded into a Spreadsheet file of the Microsoft Excel^® software. It is a technology upgrade from the original COTSIM program (Chen et. al., 1992) with a new user interface and an improved capability. It is a software tool that allows growers to do "what-if" comparisons on the harvesting of a given farm to determine the most appropriate amount of resources required to harvest the cotton. It is a software tool that an equipment manufacturer can use to determine whether or not a new harvesting technology can be economically introduced into the market place. The simulator uses economic information and time-and-motion data obtained from the field operation of different equipment. These variables may be easily modified to reflect changes in harvesting technology.