“Change we are leading” is the theme of CLOUD 2013. Cloud Computing has become a scalable services consumption and delivery platform in the field of Services Computing. The technical foundations of Cloud Computing include Service-Oriented Architecture (SOA) and Virtualizations of hardware and software. The goal of Cloud Computing is to share resources among the cloud service consumers, cloud partners, and cloud vendors in the cloud value chain. The resource sharing at various levels results in various cloud offerings such as infrastructure cloud (e.g. hardware, IT infrastructure management), software cloud (e.g. SaaS focusing on middleware as a service, or traditional CRM as a service), application cloud (e.g. Application as a Service, UML modeling tools as a service, social network as a service), and business cloud (e.g. business process as a service). Extended versions of selected research track papers will be invited for potential publication in the IEEE Transactions on Services Computing (TSC), International Journal of Web Services Research (JWSR), and International Journal of Business Process Integration and Management (IJBPIM). Both TSC and JWSR are indexed by SCI and EI [Link]. CLOUD Proceedings are EI indexed. According to Thomson Scientific, JWSR is listed in the 2008 Journal Citation Report with an Impact Factor of 1.200. The journal ranks #47 of 99 in the Computer Science, Information Systems and ranks #37 of 86 in Computer Science, Software Engineering. Under the umbrella of the IEEE 2013 World Congress on Services (SERVICES 2013), CLOUD 2013 will co-locate with the following service-oriented sister conferences: the 20th IEEE 2013 International Conference on Web Services (ICWS 2013), the 10th IEEE 2013 International Conference on Services Computing (SCC 2013), the 2nd IEEE International Conference on Mobile Services (MS 2013), and the 2nd IEEE International Conference on Big Data (BigData 2013). The five co-located theme topic conferences will all center around "services," while each focusing on exploring different aspects (cloud-based services, web-based services, business services, mobile services, and Big Data-based services). To discuss this emerging enabling technology of the modern services industry, CLOUD 2013 invites you to join the largest academic conference to explores modern services and software sciences in the field of Services Computing, which was formally promoted by IEEE Computer Society since 2003. From technology foundation perspective, Services Computing has become the default discipline in the modern services industry.