This paper discusses a goal-based approach for the engineering of capacity-driven Web services. In this approach goals are set to define the roles that these Web services could play in business applications, to frame the requirements that could be put on these Web services, and to identify the processes in term of business logic that these Web services could implement. Because of the specificities of capacity-driven Web services compared to regular (i.e., mono-capacity) Web services, their engineering in terms of design, development, and deployment needs to be conducted in a complete different way. A Web service that is empowered with several capacities, which are basically operations to execute, has to know which capacity it can choose from several capacities for triggering at run-time. For this purpose, the Web service takes into account different types of requirements like data and privacy that are put on each capacity empowering this Web service. In addition, this paper shows that the goals in the approach to engineering capacity-driven Web services are geared towards three aspects, which as business logic, requirement, and capacity. © 2010 IEEE.