There are several well-controlled studies that compare knowledge-based early teaching with game teaching, and their conclusion is the same: children who have received early training have higher recent scores in some exams that specifically test these training contents (this is not surprising). However, these early advantages were diluted within one to three years, and at least some studies show that they even eventually became disadvantages. Early knowledge transfer has not brought any benefits to long-term study. What is more sad is that this kind of education will bring adverse effects in the long run, especially in making friends and emotional development.

Germany and the United States are countries with very developed education. This is not the so-called abandonment of preschool education, but also giving children their own time. Their own IDE learning methods will not affect their development, and all aspects of guidance are to let children find their own direction, rather than being blindly guided by parents or teachers.