The purpose of this study is to explain the relationship between teacher, student and home variables and their relation to, attitude to and achievement in science in the third-year of intermediate boys' schools in southwest Saudi Arabia.The sample chosen comprised of 1129 students drawn from seven local education authorities, 25 schools and 60 classes, with 29 science teachers.Six instruments were used to collect the research data: a carefully-constructed science achievement test was designed especially to assess student achievement in science. Previously developed questionnaires, namely, the isspq, atssa, school achievement motivation were used. In addition, demographic data were obtained from students and teachers. The data were submitted to spss program for various analyses, including descriptive and product moment correlation.Teacher was the unit of analysis in which 29 teachers' means for every variable was calculated.The findings reveal that integrated science teachers tended to show reasonable positive classroom behaviour in all items of teacher pre-classroom behaviour and teacher classroom behaviour.The correlation analysis revealed that negative correlation was found between teacher's qualification and student science achievement. Positive significant correlation existed between teacher variables of teaching experience, teacher pre-classroom behaviour, teacher classroom behaviour and student attitudes towards science.Positive correlations were also found between school achievement motivation and student attitude towards science.Significant positive correlation was found between teacher classroom behaviour variables and student variable of school achievement motivation was also found.There was positive significant correlation between time spent on homework and student variables of school achievement motivation and home variables of mother's education and occupation, as well as with the study outcomes of attitude towards science.In view of the low correlations by some variables investigated, and in order to provide more evidence for or against the results obtained, it is recommended that further research is necessary using different methods,and that other variables be included in future research.