Interim Programme or Project Managers

The questions I am asked most about what I do are not about project management but about being an interim manager:

1. Why would an organisation bring in an interim manager to run their project or programme?
2. What’s the difference between an interim and a contractor?
3. What’s the difference between an interim and a consultant?
4. Isn’t it cheaper to employ someone properly?

My short answers are: expertise, objectives over attendance, stewardship not advice, no!

I hope the rest of this explains the answers.