This article reviews various definitions of constructivism, and discusses various approaches to constructivist pedagogy in schools. Constructivism is only one of the many ways students learn. Students learn from many different ways of teaching. Teachers use constructivist pedagogy to improve learning. However, the constructivist approach to learning and teaching, by itself, as a method of teaching, is unlikely to be effective. Major variables impacting on the quality of the learning process include social, cultural, economic and ideological dimensions. It is argued that the effectiveness of constructivist pedagogy is dependent on the quality of teachers, students' characteristics and their SES, and school's location. The article offers pre-service teachers with an insight as to why constructivist pedagogy is essential in supporting other approaches to learning and teaching. Suggestions are made on how to improve constructivist pedagogy, with a range of effective strategies for enhancing learning in the classroom.