In order to bulk the units up to the right amount of credits for the psychology award, we need to take a look at SQA unit Psychology: Theory & Methods (H1WJ11)
'But we just did research methods and we've looked at loads of theories!' I know! That's why this unit should be an absolute breeze. We've already covered most of the content but don't worry if you've deleted it to make space for other subjects, follow the pages here and you wont go wrong.
First Up... Read the specification for the unit and in particular the 'Evidence Requirements for this Unit' section