The following diagram depicts the general flow of SAP Diagnostics:
The main view of SAP Diagnostics displays all of the transactions in a scenario run for which there is SAP diagnostics data. Each transaction can be broken down into server-time components, or first into the dialog steps that comprise a transaction, and then into server-time components. The server components can further be broken down into sub-components or other related data.
There are three independent/parallel views: Dialog Steps per Second, OS Monitor, and Work Processes. These do not generally participate in the breakdown flow, and you may choose to display or hide them.