The term “research” in IB Psychology refers to theories and studies. It is absolutely essential to develop the skill of being able to

THEORIES (Link)

The above link will take you to a page that has some good guidelines on how to go about evaluating a psychological theory.

STUDIES (Link)

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.