Incidentally, ever since we have pretty much completely opted out of the 100 book challenge program, as I can not remember the last time my son read an actually 100 book challenge book at independant reading time at school or at home, his reading achievement level is really going up quickly and nicely. In my opinion his rising achievement level is the best evidence that the 100 book challenge program is not necessary. When he is forced to do the program his reading levels drop or stagnate .. the more we move away form the 200 book challenge books the better his reading gets.