This section outlines the basic sequence of tasks that might be employed in a typical CatchmentSIM project. The algorithms are described in detail in this section because a keen understanding of their respective approaches, advantages and limitations is fundamental to applying them successfully. To get help with a specific menu item, form or function, the Program Reference information in the following section may be more appropriate. Hyperlinks are provided for each section which refer to the Program Reference section which contains specific instructions for using the particular tool.