The New Technique of Curriculum-Making

Why should there be a need for a new technique of curriculum-making?

It is quite restricted at the age of three, wider at the age of six, still wider at the age of ten, and in each later year, grows and changes. Now, as the activity analyst seeks to discover the vocabulary activities, which of the many age levels is to be analyzed? Not any particular age level. It is the life series of vocabulary activities that are to be discovered.