This study employed the repertory grid technique to investigate how a sample of 27 student teachers in Hong Kong developed a personal sense of teaching efficacy. The analysis indicated that the third year students' perceptions were more homogenous than were those of the first year students. The results also indicated that teaching efficacy was viewed in terms of the dimensions of concern for instructional participation and learning needs of pupils, communication and relationships with pupils, academic knowledge and teaching skills, lesson preparation, management of class discipline, teaching success, teaching commitment, and a sense of self-confidence. Experiences of teaching practice, electives, pupils, and teaching practice supervisors (Electives) were the major sources for the development of a sense of teaching efficacy. Implications of how those aspects of teacher training can be more effective in engendering a sense of efficacy in the student teachers are discussed. [Copyright of Educational Psychology is the property of Routledge. Full article may be available at the publisher's website: http://dx.doi.org/10.1080/01443410050027982]