The importance of reflection in supporting the continued professional learning of preservice practitioners is well recognised. This study examines one aspect of the outcomes of preservice teachers' reflection: the development of their own self-image as a teacher. In making the transition from student to teacher, preservice teachers create their own professional identity. Their ability to articulate this identity is examined through a new construct, a "teachers' voice". A teachers' voice, develops when preservice teachers interpret and reinterpret their experiences through the processes of reflection. A teachers' voice is articulated as part of the persons' self-image. The construct, a teachers' voice, was investigated by examining changes in preservice teachers' contributions in an online discussion forum. Two complementary approaches of content analysis were applied. Both methods revealed changes in preservice teachers' levels of engagement and showed that in the first semester of preservice teacher education, the majority of preservice teachers moved towards a more professional stance in their contributions. (Contains 5 tables and 1 figure.)