Using Korthagen's (2010) three-level teacher learning model, I conducted a qualitative study addressing a central question: What factors contribute to preservice teacher development of knowledge about teaching during field experiences? Data were collected through interviews, supplemented by observation videos and document analysis. The findings show that participants showed some progress in their knowledge about teaching, which could be attributed to the opportunity to reflect on practice in their university-based courses during their field experience program. Moreover, there seemed to be a difference in the level of the development of knowledge about teaching between the two study participants. This difference could be attributed to subject matter mastery, good instructional support, having more diverse coursework, and having a disposition to focus on students. This study suggests that teacher education should provide experiences in which needs and Gestalts are triggered and elaborated, and preservice teachers are given opportunities to reflect on those experiences.