A study addressed educational and psychological issues raised by the phenomenal growth of Irish-medium pre-schools ("naionrai"). Data were gathered in surveys of almost 2,000 parents, over 170 teachers and advisors, and 225 children in 25 Irish-medium pre-schools in both "Gaeltacht" (Irish-speaking districts) and "Galltacht" (English-speaking districts) areas were tested for cognitive and linguistic development. Results indicate that children make significant advances in Irish language development during their time in the "naionrai," which leads to increased use of Irish in their homes as their parents try to help them acquire the language. Many recommendations for future development of the "naionrai" are included. The report is presented in both English and Irish. The survey forms are appended. Contains 296 references. (MSE)