Winter School on Network Optimization: The 2nd edition of the Winter School on Network Optimization is organized by the Centro de Investigação Operacional (CIO), University of Lisbon, and will take place at Hotel Sana, Estoril, from the 17th to the 21st of January, 2011. The Winter School is one of the major activities of the European Network Optimization Group and it intends to provide an opportunity for PhD students to get together and attend high level courses in the field of Network Optimization. The event is also endorsed by APDIO.