https://www.slab.org.uk/guidance/advice-and-assistance-matters-covered-by-a-diagnostic-interview/
Diagnostic advice and assistance is the most basic level of advice and assistance. It allows you to provide advice and assistance on the application of Scots law to particular circumstances affecting your client that are not contained in the listed categories.
Where your client’s problem does not relate to any of the listed categories, you can give a diagnostic interview to find out if you still consider that your client should receive further advice and assistance. You may consider if some other agency might be able to help them. A diagnostic interview includes: