For my final year project I am conducting an evaluation of a VoIP implementation of the large multinational corporation I am currently working for.

Obviously there are a number of approaches to evaluation and it's important I just stick to the one area as theres no way I can cover it all.

I'm currently considering the idea of evaluating wether the money spent (and still being spent) on the project was a sound investment.

Does anyone have any experience in conducting evaluations such as these or have specialities in this area, or infact des anyone have any other ideas for sectors to concentrate the evaluation on?

Any kind of help for general topics/questions to cover would be great.

Thanks