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Abstract. Enabling the diffusion of lightweight service composition approaches among end users necessitates the appropriate understanding and establishment of the correct user requirements that lead to development of easy to use and effective software platforms. To this end, a user-centric study which includes 15 participants is carried out to unravel users' mental models about software services and service composition, their working practices, and identify users' expectations and problems of service composition. Several examples and prototypes are used to steer this elicitation study, among which is a simple composition tool designed to support non-programmers to create interactive service-based applications in a lightweight and visual manner. Although a high user acceptance emerged in regard to "developing service-based applications by end users", there is evidence of a conceptual issue concerning understanding the notion of service composition (i.e. end users do not think about nor do they understand connections between services). This paper discusses various conceptual and usability problems of service composition and proposes recommendations to resolve them.

With the success of Web 2.0 we are witnessing a growing number of services and APIs exposed by Telecom, IT and content providers. Targeting the Web community and, in particular, Web application developers, service providers expose capabilities of their infrastructures and applications in order to open new markets and to reach new customer groups. However, due to the complexity of the underlying technologies, the last step, i.e., the consumption and integration of the offered services, is a non-trivial and timeconsuming task that is still a prerogative of expert developers. Although many approaches to lower the entry barriers for end users exist, little success has been achieved so far. In this paper, we introduce the OMELETTE 1 project and show how it addresses end-user-oriented telco mashup development. We present the goals of the project, describe its contributions, summarize current results, and describe current and future work.

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Abstract. The emerge of web services in Service-Oriented Architectures (SOA) within companies or at the global internet oers new ways for the creation of web applications. Even though the composition of services via business processes are covered by existing tools and solutions, concepts for a lightweight service consumption are still in a preliminary phase. The complexity of state-of-the-art SOA technology prevents users with limited IT skills getting easy access to web services and their oered functionalities. This paper presents a user-centric design approach to model and create simple service-based applications in a graphical way without being necessary to write any code.