Abstract: This paper is a report on the findings of a PhD study, which examines technology integration in teaching mathematics. This study concentrates on public high schools governed by the New South Wales Department of Education in Australia. The focus of this paper is on the necessity for professional development to enhance the use of technology in Mathematics. This study has been influenced by my hypothesis that many teachers need inservicing and are reluctant to use technology. Central to my concern was finding ways to encourage teachers to incorporate technology into mathematics teaching. Findings of this study indicate that there are factors that hinder mathematics teachers from using computers in the classroom. The major factor is a lack of professional development to facilitate the use of computers in mathematics teaching and learning.