Efficiency in complex systems : self organization towards increased efficiency This book uses new ideas and language for understanding how self organization and complexity trend toward increased efficiency. Different measures for efficiency from multiple disciplines are used to probe the ones that provide the most insight. One major goal is to seek a common framework to trace the increase of efficiency as a measure of the level of organization and evolutionary stage of a complex system. The chapters come from a satellite meeting hosted at the Conference on Complex Systems in Cancun 2017. The contributions will be peer reviewed and contributors from outside the conference will be invited to submit chapters to ensure full coverage of the topics. This text will appeal to students and researchers working on complex systems and efficiency. Increasing of efficiency of cities in self organization and evolution Efficiency of Grammars for Natural Languages The constructual law and efficiency in self organization A focus on the contrast between ‘operators’ and ‘interaction systems’ when analysing flows and efficiency On the origin of universal patterns Efficiency as an attractor in self organization Mobin Grammar: Unique Computational Efficiency Efficiency of Energy Transfer in Rayleigh Benard Convection Complexity as a manifestation of symmetry breaking in self organizing systems New Approaches of Analyzing Efficiency and Size Trends in Evolving Computer Architecture. .