The traditional prep-school program began for boys about 8 years of age. Early prep-schools were flexible about this, but fter World War I, increasinglt the schools became more strict boy the age of entry. After World war, escpecially by the 1970s, prep schools became establishing pre-preps. They varied as to the age of entry, but commonly they dealt with children 5-7 years of age. There were many reasons for this development. There was the obvious academic purpose of ensuring that the children were properly prepared for preparatory school. Having a pre-prep ensured that the children could move seemlessly into the preparatory program. It also should be remembered that prep schools are all small businesses. Having a pre-prep ensured a continuity of new entrants into the preparatory school.