Results of this manuscript dissertation indicated that preservice teachers found themselves immersed in professional development with mathematics curriculum materials, textbooks, and state curriculum guides during coursework and fieldwork experiences. They had the opportunity to develop an understanding of the variety of mathematics instructional resources available to them that were different from what they were used to, and also had opportunities to consider the unexpectedly complex nature of many of the materials. The preservice teachers found themselves negotiating balance between university coursework and fieldwork expectations as they evaluated, adapted and supplemented materials during coursework and fieldwork. The results from these chapters not only illustrate teacher learning with and about curriculum materials, but also point out opportunities within teacher education for preservice teachers to question well-established beliefs and practices regarding mathematics teaching and mathematics instructional resources as they encountered disequilibrium in multiple contexts. Overall results also highlight possible missed opportunities for learning and the importance of human resources within teacher education as it relates to preservice teachers’ encounters with mathematics curriculum materials and instructional resources.