This study investigated the views of Turkish and U.S. prospective mathematics teachers on the use of advanced calculators with Computer Algebra Systems (CAS) in algebra instruction. The possible roles for CAS suggested by Heid and Edwards (2001), along with the black and white box dichotomy and Technological, Pedagogical, and Content Knowledge model were used as conceptual frameworks. An open-ended questionnaire and group interviews revealed participants' views and beliefs about why, when, and how they prefer to use CAS. Results revealed the similarities and differences in Turkish and U.S. participants' views regarding the use of CAS when teaching and learning of algebraic manipulation.Key Words: Mathematics education, teachers' views, technology