These books certainly are not appropriate for high school students (the age level I teach), but they are the perfect resource for their teacher. A high school student needs very clear instructions and needs reassurance that he is on the right track. These books are not clear enough for these students.

However, as a teacher, I can adapt the material, write my own labs, and give the students something that is on their level.

I've done the electricity unit, as a student, and realized that there was quite a lot about circuitry that I don't know. I was a Physics major, but I never truly understood the material, I only thought I did. I'm looking forward to trying some of the other units and finding out what else I don't understand!

The other useful feature of these books is the cost. The labs use only very inexpensive equipment. For someone like me in a small, rural school, this is a godsend! In a few years, I hope to develop my program to the point that my students will get a good, high-level education, and low cost labs help make this possible sooner.