The use of electronic computers in the 1954 ,Economic Censuses made possible more extensive, refined and complex editing and tabulating techniques than had ever been attempted with equipment previously available. This paper is confined to experiences with such computers in processing the Census of Manufactures although Univac was equally important in the conduct of the Business Census. Beginning with a discussion of the advantages of the computer in determining the accuracy of the reports submitted in the Census, the imputation, disclosure analysis and tabulation programs are reviewed with a view toward those aspects needing improvement in the future. Some of the very real difficulties associated with the use of an electronic computer in a large non-repetitive statistical undertaking will be described later in this paper. The Census of Manufactures is a multi-phase statistical undertaking of large magnitude. The basic input and output measures of manufacturing activity-employment, materials, fuels and electric energy used and products made are obtained in considerable detail and in a related manner. Supplemental information of the structure of manufacturing is called for in the fields of inventories, capital expenditures, equipment in place, water use, and distribution of sales by type of customer. Reports are required from each manufacturing plant. The reporting effort is substantial for many companies, especially those with several plants in different industry lines. Although the Census inquiries are carefully designed to conform with record-keeping practices, the report form is necessarily long and susceptible to error on the part of the respondent, particularly the respondent whose records do not follow the usual pattern. Accordingly,, the returns must be thoroughly screened at some stage of the processing for errors of significant size. The tabulations from the Census are varied and involve classifying each establishment several ways: by industry, by geographic location, by size, by type of ownership, by degree of product specialization, etc. The multiplicity of editing checks and tabulations needed for a present-day Census of Manufactures call for the imaginative utilization of the most advanced statistical tools and techniques available. Testing Accuracy of Manufacturers Reports by UNIVAC