The document contains several examples of different diagramming techniques used for documenting processes and systems, including: 1) A DFD diagram showing the process of peeling an apple. 2) Context and level diagrams for an employee payroll system. 3) A state transition diagram showing different states in a system. 4) A decision tree for determining an insurance surcharge. The document also outlines some common rules and symbols used for creating diagrams to represent processes, data flows, and decisions in systems.