Graham Pennington's demonstration of a dural drag assessment.
A little video of Graham Pennington setting up a client correctly on a couch, assessing dural drag and correcting the issues that he found.
This is what you'll be taught from the very start, how to hunt the cause, correct it then confirm that you have corrected it.
Assessment is not focussed on symptoms, whether of limited function or pain. It looks at the whole body and attempts to isolate the imbalances and dysfunctions which are creating a system-wide problem, which then expresses in the symptoms the client presents with.