This study is a part of a large study that investigated the Assessment Practices of Mathematics Teachers who also teach AP Statistics. In this paper I investigate the thinking skills that assessment items used mathematics and AP Statistics classroom assess. Two teachers who were teaching mathematics and AP Statistics participated in this study. Each teacher was observed 12 times in class. Artifacts were also collected from each teacher, mainly oral questions and written questions. A mathematics taxonomy framework was used to analyze the characteristics of the assessment items. The results of the study indicated that assessment questions (oral and written) in AP Statistics and mathematics mostly assessed recall of factual information, comprehension of factual information and routine use of procedures.