A weakness of the bottom-up?

-It has significant faliures -Rachel Nickell case study in which the true criminal was not found until 16 years after the crime as they had ruled him out originally due to him not fitting the height suggestions of the profile they generated. -Due to the crime only happening once, they were unable to gather a lot of information about the criminal through the usual techniques of crime mapping, meaning that they couldn’t establish any patterns that created personal data to help build a profile. Lead to inaccurate ideas of the criminall, causing the investigation to be drawn out -Bottom-up approach is based on the assumption of a criminla which leads to a less accurate picture, more suited to serial offenders