This document is an English-language abstract (approximately 1,500 words) of a Bulgarian study of six-year-old schoolchildren. Data gathered in a number of countries where children are enrolled at school at the age of six is a sound basis for analytical study; in nations where the enrollment age is seven, such as Bulgaria and the USSR, children's…

In a study of ways of preventing mental retardation in the population of a city slum, surveys were conducted. The major finding was that the variable of maternal intelligence was the best single predictor of the level and character of intellectual development in the offspring. The survey also showed that the lower the maternal IQ, the greater the…

A project conducted several years ago to develop informal mathematical learning experiences at kindergarten level is compared with the results of the work-book type (formal) program being used at that time. It is hypothesized that kindergarten pupils who study mathematical concepts in a planned, sequential, systematic, but non-workbook (informal)…

An evaluation of the New York State Experimental Prekindergarten Program was begun in 1975 to provide longititudinal data on the effects of prekindergarten on children's development over a period of 5 years. Data were collected on a variety of items, including children's test performance at various times, family background, ratings by teachers,…