Researchers must organize data in tables and charts for a variety of reasons, ranging from presenting results for a statistical analysis, to describing trends or differences across groups, to reporting health data from public use data sets for other researchers to use in their own analysis. This lecture describes a set of principles for effectively organizing data to suit the particular task at hand. Suggested readings: J.E. Miller, 2007. “Organizing Data in Tables and Charts: Different Criteria for Different Tasks.” Teaching Statistics.29(3):98-101. J.E. Miller, 2004. The Chicago Guide to Writing about Numbers. The Chicago Guides to Writing, Editing and Publishing. University of Chicago Press, Chapters 5 and 6.