Should I use my older Instructor's Guide or repurchase a newer edition?

Our first answer to this question would be that the product you used in the past is still a viable, complete product. Your older Instructor's Guide was a great product when you first purchased it and still is! However, if you are interested in seeing what changes have been made to our IGs, this chart may help you make up your mind when it comes to repurchasing:Instructor Guide Update Chart.

Please keep in mind that if you use a new IG with an older Core package, some of the books may have changed.