Dave and Safira - Sorry I didn't respond much sooner to the question.
This book is primarily focused on young adults and adults, although I think a few of the exercises in the CREATIVITY chapter could be used with children if they were at an intermediate level.
If you are interested in reading more about PROVOKING THOUGHT, the following are a few book reviews:
Book review from Hotch Potch English Book review from Developing Teachers Book review from TEFL.NET Book review from IH Journal Book review from English Teaching Professional