Asking "why, where and when?" is irrelevant: "Let's Start with you".
When interviewing candidates, most employers and recruiters ask the usual questions:
Why are you interested in the job?
Where have you gained this specific experience?
When are you available to start?
Feeling sick? Sound familiar? Read on.
The truth is, when you interview a candidate that came from a recruiter, they will be screened for you. You'll find that recruiters who care about providing you with great candidates usually go through the mill with their candidates.
This being said, wouldn't you prefer to open an interview and conduct it in a more personal way? After all, you're looking for someone to fit your cultural fit - right?
Don't get me wrong, you can still ask questions on this like, but don't let that be the centre focus of the interview: make the candidate the centre focus. why? Because employees that look after the company are hired by employers that look after them.
Try this: "I heard a lot about you and I'm fascinated: Let's start with you, tell be about you, what makes you come alive?"
Try it once and guaranteed you'll want to keep doing it again and again.