This special issue collects a selection of the best papers emerging from the 2007 International Workshop on Nature inspired cooperative strategies for optimisation (NICSO 2007). Nature inspired strategies are being used in ever more widely ranging settings spanning not only computational problem solving (e.g. Neural Networks, Simulated Annealing, Ant Colony Optimisation, etc.) but also on a variety of other disciplines such as chemistry, physics and engineering. Moreover, cooperative strategies are gaining momentum across many computer science disciplines such as machine learning, classification, data mining, and, of course, optimisation. The NICSO workshop series and its associated publications have been actively helping to advance the state of the art in Nature inspired cooperative strategies for optimisation since its inception in 2006. Some, but not all, of the main themes covered by NICSO include, computational studies in adaptive behavior, amorphous computing, artificial life, ant colonies optimisation, artificial immune systems, swarm intelligence, software selfassembly and self-organisation, evolutionary algorithms, neural networks, etc. as applied to numerical, combinatorial, non linear, dynamic and/or noisy optimisation. NICSO 2007 received 83 papers, out of which 46 were published in the proceedings under Springer’s Studies in Computational Intelligence series. From these 46 papers 12 were invited to the special issue in Natural Computing for which authors were asked to submit extended and improved versions of their works. Submitted papers went through a rigorous two (in some cases three) rounds of additional independent reviewing. Each paper was assigned three or more reviewers. From the 12 papers received, the following five were accepted for this thematic issue. In ‘‘Honey Bees Mating Optimisation Algorithm for Large Scale Vehicle Routing Problems’’ by Y. Marinakis et al., the authors present a sophisticated multi-hybrid algorithm for the vehicle routing problem. Their algorithm combines two metaheuristics and one heuristic to produce a balanced allocation of effort between local and global search. The Honey Bee Optimisation algorithm that is seeded with an improved variation of
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