Invited talk: Harmoneous Personnel Scheduling Dr. Gerhard Post, University of Twente (NL) and ORTEC Friday, 7 December 2007, 14:00 in 69/E18 Abstract: Scheduling personnel in organisations that work around the clock is a heavily constrained problem. These constraints come from employers and employees, but also from legislation and collective labour agreements. In this talk we first give an overview of the different aspects that play a role, and secondly describe a local search algorithm that is used in the commercial package HARMONY.