3 a) The first step in comparing a footwear mark recovered from a crime scene to a suspects' item of footwear is to compare the pattern. State the other three factors you would take into account, clarifying whether they are identifying or class characteristics.

(6 marks)

3 b) Critically discuss whether it is possible to use statistics successfully when intrepreting footwear mark evidence. You may wish to refer to the R v T within your answer.