charts make data comparison easy. Tables present complex numeric data better than charts. • Hierarchy diagrams present relationships; process diagrams illustrate steps for procedures • Pie and doughnut charts show relationships of parts to the whole. • Bar charts compare value variations, different data types at one time, or the same data type over time. • Multiple-bar charts represent more than one value at one time; stacked-bar charts present values of each part within a variable. Ch 12 - 17