Hi Rubina
This is probably the most unhelpful answer ever on this forum but you won't find the information anywhere on the CIPD website as the information is restricted to assessors. In general though it depends on your critical evaluation, analysis and synopsis of the subject matter. Also good referencing is indictive of the scope and depth of your research, however you should talk with your course tutor as to what, in their opinion, would constitute a pass, merit or distinction.
Sorry not to be more helpful