Not enough for an educational software product

This product is similar to a very classical printed Übungsheft. The advantages of the medium PC are so good we did not used. There are a small number Übungungen per section, and it will not generate any other similar (difficult or easier, the level of the child custom) exercises on the software. After a time, the child has the solutions realized and can not continue to practice. The structure is similar to the structure of a book and has a few playful or tricky elements.
As educational software, it is a disappointment.