This module, one of 25 on vocational education training for careers in environmental health occupations, contains self-instructional materials on preparing data for analysis. Following guidelines for students and instructors and an introduction that explains what the student will learn are three lessons: (1) constructing a table by organizing data into rows and columns; (2) constructing graphs, including a line graph, a histogram, and a frequency polygon, by displaying the relationship between two sets of exact data; and (3) constructing charts, including bar charts and geographic coordinate charts, by displaying statistical information using only one set of exact data. Each lesson contains objectives, recommended methods and locations for practice, performance criteria, equipment and supplies to perform a task, detailed step-by-step instructions for learning a task, and performance exercises. Four performance tests cover tabulating data for analysis; preparing graphs; preparing histograms and frequency polygons; and preparing bar charts and maps. (CT)