The document discusses diagrams and flowcharts. It defines what a diagram is and some common types of diagrams, including graphs, charts, and maps. The document then focuses on flowcharts, defining them as a graphical representation of information or program sequences. It lists the common symbols used in flowcharts and describes the four general types: document, data, system, and program flowcharts. Finally, it provides tips for creating flowcharts and includes an example flowchart.