Workshop Proceedings ACES MB 2009 Second International Workshop on Model Based Architecting and Construction of Embedded Systems October 6 th , 2009, Denver, Colorado, USA Organized in conjunction with MoDELS’09 12 th International Conference on Model Driven Engineering Languages and Systems Edited by: Stefan Van Baelen (K.U.Leuven - DistriNet, Belgium) Thomas Weigert (Missouri University of Science and Technology, USA) Ileana Ober (University of Toulouse - IRIT, France) Huascar Espinoza (CEA - LIST, France)