The files in these directories are meant to accompany "Introduction to Probability Models" by Sheldon Ross. The fundamental idea in creating most of them is that it's nice to be able to generate new random samples at the touch of a button, to see how things really change from one sample to the next. In most cases, that button is F9, which tells the spreadsheet to recalculate, and hence generate new random numbers. The building blocks for most of these random numbers are Uniforms, from the rand() function, and Exponentials, which we can get by using -ln(rand())*mymean. Andrew M. Ross April 2004