You do want to make sure they are qualified to teach the subject matter and experienced with whatever issues are relevant, but don't forget to consider the less quantifiable. Your child must feel comfortable with this person- a PHD doesn't guarantee they'll be successful in dealing with your child.
Some tutors come to your home; others prefer you come to theirs. Additionally, your child's school may allow tutors to visit during lunch or other free periods.\012
How will you determine my child’s needs?
How will measure my child’s progress?
Can you share with me some of your success stories?
Success stories might include things such as improved test scores, improved classroom grades, better homework completion, improved self esteem etc. You might also consider asking about a client they were unable to help and why.\012