This study explored how the initial concerns of preservice teachers changed over the course of a 1-year secondary school teacher training program in New Zealand. It also examined those concerns as they related to teaching efficacy and experiences on practicum. The findings reveal that students develop a more differentiated set of concerns about teaching as they gain classroom experience and their concerns become more realistic with that experience. The results also indicated that teaching efficacy and teaching concerns are not identical or interchangeable but instead have a reciprocal relationship. As teaching efficacy increased, concerns about teaching decreased.