The Industry and Occupation Imputation Project was undertaken as a joint effort of the Bureau of the Census and the Social Science Research Council (SSRC), with the goal of producing 1970 census public use files containing industry and occupation codes that are directly comparable with the corresponding codes on the 1980 public use files. This would allow researchers to analyze changes in job-related characteristics that took place during the decade of the 1970's. This report is intended as documentation of the statistical techniques used in the project, and summarizes the software development, computational and data-manipulation tasks performed to implement them and produce the necessary files. A detailed history of the project will be produced by other participants.