Hi, considering the importance of serious case reviews in that a child/ren has died or been badly injured because of abuse or avoidable accidents this criteria is asking you to look at what that means for individual people (what did/didn't they do) and the way that agencies work (did they fail to protect the child or did they do everything they reasonably could). The outcome of a SCR will include recommendations that improve professional practice, cause agencies (including preschools/nurseries) to update their policies and procedures so that they can guard against the situation from happening again.
This article might be useful reading
Haringey's children's services
Which handbook are you using?
If it helps
** page 194 of the EYE Childcare & Education handbook looks at serious case reviews or use the index of your book to find more information
Best wishes xx