As private tutors, are we able to provide guarantees? This company advertises on the TV, and they guarantee a single Grade level improvement after a commitment (by contract, I guess) of 3 hours per week for twelve weeks. Their website is: http://tutoring.sylvanlearning.com/ Last year here in Barbados I considered the possibility of requiring a contract, 100.00B$ up-front to reduce problems of attendance and non-payment. My contract was for ten lessons at 10.00B$ a lesson, half hour each duration. I offered continuity and progression, but not any guarantee concerning improvements. Are there any tutors who offer such a guarantee as Sylvan, and does it work?