The theme of DisCoTec is technologies supporting modeling, development and maintenance of distributed network-based systems and applications. DisCoTec (Distributed Computing Techniques) co-locates three successful related and complementary conferences: Coordination'08: 10th International Conference on Coordination Models and Languages, DAIS'08: 8th IFIP International Conference on Distributed Applications and Interoperable Systems, FMOODS'08: 10th IFIP International Conference on Formal Methods for Open Object-based Distributed Systems. DisCoTec comprises also one day pre-conference workshops. Each conference covers multiple research dimensions, viz. theory (e.g., underlying formalisms), conceptual (e.g., technical designs and conceptual solutions) and applications (e.g., case studies and industrial best practices). This federated event is unique at providing an opportunity for researchers and practitioners both in academia and industry, to meet and understand recent developments in distributed computing, interacting with colleagues in adjoining related fields. All three conferences share the study of the distributed, conceptual and ubiquitous aspects of modern computing systems, and share the resulting application-pull created by the World Wide Web. Modern information systems rely increasingly on a coordinated combination of concurrent, distributed, mobile, reconfigurable and heterogeneous components. For DAIS, the primary emphasis is on distributed applications, including their design, implementation and operation, appropriate software engineering methodologies and tools, as well as experimental studies and practice reports. FMOODS concentrates on the precise modeling of distributed systems. The conference addresses especially component- and model-based design, service-oriented computing and software quality. Coordination addresses models, architectures, languages, verification techniques necessary to cope with the complexity induced by the demands of today's development of distributed systems.