This is a wonderful set. Very colorful and educational without being dry and montonous. Just the right mix of written work and hands-on experiments, many of which use things you'll already have around the house. I highly recommend buying this entire set. I pieced mine together used and in the end I don't think I saved much, I definitely didn't save myself any time. I have my son read the assigned passage from the text and complete the page from the activity manual, then the next day I have him write out the vocabulary words and definitions as well as copy the review questions and write the answers. This is set up so that you cover 1 chapter every 3 weeks. The CD-ROM in the TM contains the quizzes and the quiz key (sure wish they had done that with the tests...), as well as other printables. A great science program!