Title: Slicing EFSMs David Clark joint work with K. Androutsopoulos, M. Harman, W. Lu and L. Tratt Abstract Starting from foundational work by Korel, Singh, Tahat, and Vaysburg on slicing Extended Finite State Machines, we make improvements in their approach. First, using work on slicing Java by Ranganath, Amtoft, Banerjee, Hatcliff and Dwyer, we introduce new notions of control dependence that allow non-termination and multiple termination points, so that dependency can be calculated for any EFSM, rather than being restricted to those with a single termination point. Second, we introduce a new, less conservative slicing algorithm for EFSMs. We show some properties of these algorithms.