The previous discussion explained what a basic object is. The next section goes a step further and teaches how to create objects, how to use pre-made objects which are more detailed than just shapes, and much more! Special objects are broken into different categories. This way, someone creating a diagram of a circuit board can see only the objects which apply to them. Dia supports numerous pre-defined categories. Circuit A group for people interested in creating diagrams of electrical circuits. Ladder This one is beyond my knowledge ER Editor for Entity Relations Diagrams FS Editor for Function Structure Diagrams Flowchart A group dedicated to providing the user shapes which are commonly used in flow charts. Flow charts can be routinely found in computer programming, marketing, economics, and any other semi-linear operation which requires planning. GRAFCET A chart which diagrams the step, the action, the transition, and the condition associated to the transition. SADT Good question! UML Refer above Chronogram Uses objects to be used in a chronographic design. These are common place in time lines. Network Used by network administrators to create a design of their network. Sybase Designs diagrams display the flow of a Sybase computer network. Electric Shows flow of electricity, I guess Pnumatic/Hydraulic Allows diagraming of a device which employes hydraulics.