This is a good introduction to DOE with plenty of case studies and minimal statistics. It is the first book that I've read on DOE. The second chapter was a little confusing, with concepts such as design resolution introduced with little explanation of their significance. These concepts became clearer as I delved into the case studies, and by the end of the book I had a good grasp of the subject. A few things still mystify me, such as where the reference line in a Pareto plot comes from. It's calculated automatically by software of course, but I wish I understood the underlying maths, which goes unexplained. Still, this book will get you off the ground fast - I read it in two days.