Teachers' confidence in their ability to perform the actions that lead to student learning is one of the few individual characteristics that predicts teacher practice and student outcomes. Teachers and especially student teachers need strong efficacy beliefs in order to continue teaching during in-service education. The current study explores the factors that precede student teachers' beliefs of teaching efficacy and determine their conviction that they can influence instructional strategies, classroom management, and students' engagement. In the study 198 fourth-year students from two primary education departments in Greece completed a Teacher Efficacy Sources Inventory and a Teachers' Sense of Efficacy Scale. It was found that self-perceptions of teaching competence, personal characteristics, and motivation for teaching were contributory factors to teaching efficacy. The search for this type of information from student teachers is based on the assumption that feedback from students comprises a substantive factor in relation to the evaluation and improvement of teacher training programmes. (Contains 8 tables and 1 note.)