The purpose of this study is to examine the development of pedagogical content knowledge (PCK) for two purposefully selected beginning mathematics teachers. The PCK development of these two individuals varied due to their focus on developing particular aspects of their PCK, with one individual focusing on assessment and student understanding, and the other individual focusing on curricular knowledge. The findings of this study demonstrate the differences that exist in the development of PCK for beginning mathematics teachers. These findings also demonstrate that PCK can develop in different ways for beginning teachers.