This booklet presents the rationale and processes for ENSIM II, a computer-based long-range enrollment simulation model designed to consider variables not usually addressed in traditional projection techniques. The first ENSIM model was constructed for districts facing extensive residential growth and had as its primary focus the analysis of land-use data and the projection of new housing development. ENSIM II, which also generates residential development projections and which, like the original model, uses a basic cohort survival technique as its primary computational procedure, is appropriate for districts with either increasing or decreasing enrollments. Basic inputs into the model include historical enrollment information, census data, and land-use data. ENSIM II produces enrollment forecasts by age, race/ethnic composition, and geographical area. Separate sections of the booklet present a general description of ENSIM II, discuss data preparation procedures for the system, describe in detail specifications for input data sets, describe specifications for output data sets and a districtwide summary program, and list various subroutines and arrays and their uses. (Author/JG)