There aren't many chess trainers able to teach step 6. That is the main reason that the target group of this book has been altered. It is not a manual for chess trainers any more but a self study book for the independent learner. The difficulty level of the material goes up again. The solutions to the exercises are consequently one move deeper.
The company Chess-Steps is responsible for distributing and promoting the brand Chess-Steps, also known as 'The Steps Method' or 'de Stappenmethode'.