# Rules for constructing flowcharts

To make sure that a flowchart works, you need to follow a few basic construction rules:

- Each flowchart must have one and only one Start part.
- The flow of control must always enter a part from the top.
- The flow of control must always leave a part from the bottom (except for Decision parts, which allow the flow of control to leave from the side).
- The flow of control must not split. You can use Decision boxes to give the flow of control a choice of paths to follow, but it can only follow one of these paths.
- The no-go cursor is used to show you where you cannot drop parts or complete links.

## See also:

- Using Flowcharts parts