This study was designed to discover if preschool teaching affects children's development of social skills and behaviours. Mothers of 50 children from middle socio-economic class families attending preschools and mothers of 50 children from the same socio-economic class families not attending preschools were included in the study. "Social adaptation and skills scale" which was tested for reliability and validity was utilized in data collection. "T-test" was used in the analysis of the data. Moreover, SPSS 15.0 (Statistical Package for the Social Sciences) software was used to conduct statistical analysis. The study revealed that there was a significant difference in social skill behaviours between the two groups. (Contains 5 tables.)