The principle of troubleshooting assistance is to capitalize on experience from work orders to save diagnostic time at the time of the next breakdown of an equipment item.
For a given symptom, this consists in specifying the probable causes and the suggested remedies for each cause.

A troubleshooting help tree is defined for a template; see Template [Troubleshooting]; it may also be specified for an individual Asset.
Troubleshooting trees may be built automatically by CARL Source according to the history of work orders; see Standard jobs.

The symptoms, breakdown causes, and remedies are defined for the entire application.