This volume constitutes the proceedings of the 12th International Conference on Cloud Computing, CLOUD 2019, held as part of the Services Conference Federation, SCF 2019, in San Diego, CA, USA, in June 2019. The 24 full papers were carefully reviewed and selected from 53 submissions. CLOUD has been a prime international forum for both researchers and industry practitioners to exchange the latest fundamental advances in the state of the art and practice of cloud computing, to identify emerging research topics, and to define the future of cloud computing. All topics regarding cloud computing align with the theme of CLOUD.

This volume constitutes the proceedings of the 16th International Conference on Web Services, ICWS 2018, held as Part of SCF 2018 in Seattle, WA, USA in June 2018. The 31 full papers together with 1 short paper published in this volume were carefully reviewed and selected from 116 submissions. They are organized in topical sections such as Web Services, RESTful web services, Web Services Description Langugage, Universal Description Discovery and Integration, Service discovery and interfaces, Domain-specific security and privacy architectures, Location bases services, Sercurity Services and Markup languages.

This volume constitutes the proceedings of the 17th International Conference on Services Computing 2020, held as Part of SCF 2020 in Honolulu, HI, USA in September 2020.. The 8 full papers and 2 short papers presented in this volume were carefully reviewed and selected from 20 submissions. They cover topics such as: foundations of services computing; scientific workflows; business process integration and management; microservices; modeling of services systems; service security and privacy; SOA service applications; and service lifecycle management.