Efforts to develop a scale for the measurement of Thai children's perceptions of parental discipline of aggressive behavior are described. Subjects were 120 pupils of 11 to 13 year aged attending public and private schools in Bangkok. Major findings revealed a law positive correlation between maternal and paternal approaches to punishment of bath public and private school children regardless of sex and a high positive correlation in the use of parental punishment with private school females. Harsh discipline methods were more often ascribed to lower class parents and to fathers punishing girls. Relationships to previous studies and suggestions for cross cultural comparisons are discussed.