ii iii Foreword Welcome to Porto and the 2 nd International Real-Time Scheduling Open Problems Seminar (RTSOPS 2011). This seminar provides a venue for the exchange of ideas and the discussion of interesting unsolved problems in real-time scheduling. The format of the seminar positively encourages interaction between participants and provides ample time for relaxed discussions. The goal of the seminar is to promote a spirit of co-operation and collaboration within the real-time scheduling

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... ity. RTSOPS 2011 is organized around presentation and collaboration sessions. Each presentation session provides the opportunity to hear about a number of important unsolved problems in realtime scheduling, highlighted via brief presentations. The following collaboration session gives participants the opportunity to interact in small groups, exchanging ideas with the presenters about how the problems might be solved, and to take the first steps towards a solution. A total of 12 open problems were selected for presentation at the seminar, along with a status report on an open problem from the previous year. These proceedings are also published as a Technical