The term “research” in IB Psychology refers to theories and studies. It is absolutely essential to develop the skill of being able to
The above link will take you to a page that has some good guidelines on how to go about evaluating a psychological theory.
There are lots of ways to evaluate psychological studies. The link above will take you to a post that has lots of supporting material for evaluating studies, including explanations of key concepts like validity, reliability and ethicality.