Mathematics and Science subjects continue to pose problems to many students. This is despite the fact that these subjects are critical for technological advancement of any country. Many factors have been identified as contributing to poor performance of students in Chemistry. This book was written based on research findings about the effect of teacher characteristics on students' performance. The author found out that teacher characteristics were a greater determinant of student achievement that other school factors.The book recommends that school administrations involve chemistry teachers in decision making, especially as concerns acquisition of apparatus, so that teachers don’t feel left out in decision making. They should also be consulted when designing of laboratories. Such efforts will go a long way in boosting their attitude towards the school and hence their output.