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Features of two lesson study contexts, one with prospective secondary teachers engaged in microteaching lesson study and one with prospective elementary teachers engaged in field experiences, were investigated for providing US prospective teachers with opportunities for growth as teachers of mathematics. In both contexts, the prospective teachers (PTs) exposed their knowledge, beliefs and practices to the scrutiny of peers and other experts, developing and reconsidering their thinking and practices through the shared teaching experiences. Similarities and differences in features of the two contexts are discussed with respect to PT learning. Similarities included the importance of negotiation during teaching cycles as catalysts for PT learning, the value of the cooperative nature of the experiences for sharing varying ideas and perspectives among PTs, the merits of overarching student learning goals for PT lesson planning, and the contributions of the group products (written or oral reports of the lesson study) to the learnercenteredness of the experiences. Differences influencing prospective teacher learning included the extent of focus on mathematics knowledge, extent of focus on classroom processes and management, use of videotaped lessons as part of formative feedback, and participation of knowledgeable advisors during or at the end of the cycles. [ABSTRACT FROM AUTHOR]