The LNCS journal Transactions on Computational Science reflects recent developments in the field of Computational Science, conceiving the field not as a mere ancillary science but rather as an innovative approach supporting many other scientific disciplines. The journal focuses on original high-quality research in the realm of computational science in parallel and distributed environments, encompassing the facilitating theoretical foundations and the applications of large-scale computations and massive data processing. It addresses researchers and practitioners in areas ranging from aerospace to biochemistry, from electronics to geosciences, from mathematics to software architecture, presenting verifiable computational methods, findings, and solutions, and enabling industrial users to apply techniques of leading-edge, large-scale, high performance computational methods.This, the 40th issue of the Transactions on Computational Science, is a special issue, comprised of seven papers, and devoted to the developing and novel techniques for Trustworthy Technologies for Autonomous Human-Machine Systems. They include emerging and innovative applications of computer security-based applications, as well as theoretical contributions that are relevant to Trustworthy Technologies for Autonomous Human-Machine Systems.

Sidney the skeleton lives in Halloween Land. Sometimes, poor Sidney can feel a little lonely and not quite 'part of the crowd.' However, one thing that always makes Sidney feel better is music, and now he wants to make his own! He tries playing all sorts of battered and broken instruments he finds lying around, but none of them work. However, after attempting to play trumpets, violas and contrabassoons, our music-loving skeleton discovers that he has a very special talent - Sidney possesses musical bones! At the 'Grand Monsters' Ball' that year, Sidney enters the talent contest alongside the most weird and wonderful acts. After Harry the Hunchback's eye-watering juggling act and Frankenstein's questionable street-dancing, Sidney hopes that his own unique act will get the judges' attention...