It makes little sense to spend a month teaching decimal fractions to fourth-grade pupils when they can be taught in a week, and better understood and retained, by sixth-grade students. Child-centeredness does not mean lack of rigor or standards; it does mean finding the best match between curricula and children's developing interests and abilities.

The idea of childhood as a social invention, in retrospect, is hardly credible. In the Bible, in writings of the Greeks and Romans, and in the works of the first great educator of the modern era, Comenius, children were recognized as being both different from adults and different from one another with respect to their stages of development. To be sure, the scientific study of children and the increased length of life in modern times have enhanced our understanding of age differences, but they have always been acknowledged.

We now recognize that abuse and neglect may be as frequent in nuclear families as love, protection, and commitment are in nonnuclear families.

If learning to read was as easy as learning to talk, as some writers claim, many more children would learn to read on their own. The fact that they do not, despite their being surrounded by print, suggests that learning to read is not a spontaneous or simple skill.

Certainly, young children can begin to practice making letters and numbers and solving problems, but this should be done without workbooks. Young children need to learn initiative, autonomy, industry, and competence before they learn that answers can be right or wrong.

Learning to read and write makes little sense if you don't understand what you're reading and writing about. While we may have forgotten, most of our early learning came not from being explicitly taught but from experiencing. Kids aren't born knowing hard and soft, sweet and sour, red and green. When the child experiences those things, s/he transforms them into psychological understandings. When kids play with other kids, they learn about others and about themselves. Learning the basics of our physical and social reality is what early childhood is all about.

Children in the 21st (century) have been transformed from net producers of their own toy and play culture, to net consumers of play culture imposed by adults.