The Bureau of Justice Statistics (BJS) within the U.S. Department of Justice (DOJ), along with the U.S. Department of Homeland Security (DHS), conducted the National Computer Security Survey (NCSS), a nationally representative sample of businesses across 36 industry sectors. This report will be of interest to researchers and analysts who are interested in under- standing the methodology underlying the NCSS, including questionnaire design, survey field- ing, sampling, and weighting methodologies for this large-scale survey. The report will also be informative for scholars who are interested in analyzing the NCSS public-use data file.