Some people see the process of growth and development as very simple.
They seem to think it is something that is read out of the genes, and that when the human genome project is completed we shall have the book of life, including an understanding of all human behavior. Others take the view that the developmental process is so immensely complicated that we shall never understand it properly. I take the view that although on the surface developmental processes may look complicated, the underlying rules are analogous to those that underlie a game like chess. The rules of chess are simple, but the games that can be generated by those rules are enormously complex. What we have to do as scientists is try to understand rules that produce a design for a life.