PSA is an application that helps you diagnose a mental disorder in a new way.
You simply have to select the symptoms that are present by dragging them to the selection field.
When you're done start the Analyzer process.
This will give you some possible mental disorder diagnoses. Tap on them to see the specific criteria requirements for a proper diagnose (based on ICD, DSM).

As a quick reference usage of the app, you can tap the library button and search for a mental disorder directly. Tap on the mental disorder to see the specific criteria requirements. Or read more about the disorder by pressing the wiki button.