ROCE – P5

Hi I am struggling with a P5 question I have came along and was wondering if anyone could help me find the answer.

It is split into two parts:
1. discuss four considerations in calculating the ROCE rate and for each consideration give an example of the type of problem that can arise.
2. Discuss three circumstances in which a single ROCE rate might not be an adequate measure of performance and for each explain what should be done to supplement the interpretation of the results of the single ROCE rate.

Hopefully someone can help.

thanks