WHAT is it?
Where one psychologist examines another’s research plans/procedure/findings/article
WHY is it done?
To check the reliability of findings
To identify if there any mistakes/errors of judgement
To reduce the chance of bias, etc.
WHAT are they checking for?
WHEN is it done?
Before a study is published to check its quality and validity of the research, and to ensure that the research contributes to its field / area.
WHO does it
The process is carried out by experts in that field / area of Psychology.