An elementary version of the Questionnaire on Teacher Interaction (QTI) and a scale for determining students' enjoyment of their science lessons were translated into Standard Malay. The instruments were validated with a sample of 3,104 students in 136 classrooms in Brunei Darussalam. Scale means showed that students enjoyed their science lessons. They perceived their teachers mostly as good leaders, helping/friendly, understanding and strict, seldom allowing student responsibility and freedom, seldom uncertain or dissatisfied and seldom admonishing. Associations between students' perceptions of their teachers' interpersonal behaviours and their external examination result in science were investigated for a subsample of students