Workbook Step 1 is often used with very young children. It is possible but not ideal. It is not surprising since the step-by-step method was developed in 1987 for children from the age of 9 on.
What are the differences with the usual workbook Step 1?
Instructors (frequently parents as well) have to rely on the Manual of the first step. In the new addition a chapter will be added on teaching chess to very young children. Furthermore, it will contain information how to deal with each page of the workbook and what are the expected difficulties.