Ref checks are usually carried out on phone.
The references need to be people who have worked with the candidates and know them professionally.
During a call ask if it is ok to speak to the reference at that point of time. if ok, introduce yourself and the purpose of the call.
(Do not say we have selected XYZ for ABC position. Always say we are considering XYZ for a position in our Co.)
Assure the reference about the ref check being confidential.
Start with open ended questions like
How do you know XYZ ?
What makes him/her sucessful?
What are his strengths?
What according to you can make him a better professional? (This is to know the weaknesses.
Comment on leadership Skills
How does he/she conduct himself as a team member?
How are his/her relations with his peers (from other depts?
[u]If an opportunity arises will you hire him/her?[/u]
Thumb rules in a ref check
Let the reference speak more.
Discuss rather than ask.
Always ask the reference his current designation and Company.
Conclude by asking him if you need anymore info can you call him again?
Hope this is useful to get you started...
Regards,
Anand