If people are interested in learning why SAT scores have fallen, they should read Michael Schrage's article "How Much Should We Pay For Computer Literacy?" {Business, Sept. 27, 1986}. The answer is found in his statement, "Classroom computing is probably the biggest con job yet perpetrated by the marketing minds of PC manufacturers."

His point is that children are being made to waste time playing with a machine when they should be learning the "Three Rs."

I have no doubt that at one time manufacturers sincerely believed their computers would do wonderful things for children's education. Time has proven them wrong. Now it is necessary for the teaching profession to recognize this as well. PAUL N. NASH Arlington

Megan Rosenfeld's story about the extreme length of summer vacation {Style, Aug. 26} addressed a problem that concerns most families with children.

A solution has been successfully implemented in many Southern California schools and should be considered by districts in the Washington area. In California, many schools have switched to a year-round schedule. Children attend school for nine-week sessions followed by three-week vacations.

By overlapping the schedules at each school, the buildings are more optimally used, and both parents and teachers enjoy having the time off scattered throughout the year. It gives families an opportunity to travel in the off-season months when resorts are less crowded, and saves everyone from the interminable weeks of summer vacation, which, as the writer pointed out, was originally to help farming families and is not necessary in the urban Washington area. CATRIONA TUDOR ERLER Reston