The first workbook of an additional series: thinking ahead. Boris Friesen is the co-author.
In the workbook you will find reminders and exercises. The kind of exercises are different and more diverse than in the other workbooks. However, the themes from step 2 will be familiar.
The best moment to introduce the workbook is after step 2 plus. For students in step 3 who skipped the extra and plus books the workbook is suitable to raise their skills. Of course you can introduce some exercises from the book while you are still working in the basic workbook of step 2.