Study of Jet Fragmentation for the Measurement of the Top Mass with CDF ----------------------------------------------------------------------- Simon Sabik, University of Toronto The measurement of the top quark mass is a vast and important effort in the Collider Detector at Fermilab collaboration. A large number of high energy scientists work on the many instrumental and analytical issues in order to improve this measurement, which will lead to a test of the Standard Model. I will present an overview of the top mass measurement analysis, while keeping an emphasis on the aspects in which I am most directly involved. I will discuss how the study of the fragmentation of jets leads to an improved jet energy calibration, which is crucial to a precise determination of the top quark mass.