Preservice teacher education courses provide an opportunity for the development of knowledge, skills, and confidence in classroom and behaviour management. This study reports the change in classroom management sense of efficacy (CMSE) of a small cohort of Australian preservice primary teachers at 4 time points (precoursework, preprofessional experience, postprofessional experience, and postcoursework), during a semester-long course focused on managing challenging behaviours in the inclusive classroom. CMSE increased between the time points, significantly so, pre-post course. The sources of efficacy information available and the learning activities completed during each intervening time point are explored as possible explanations for the changes in CMSE reported. Issues in measuring preservice teachers' efficacy related to coursework are discussed.