Strong user involvement and clear business objectives, both relying on efficient communication between the developers and the business, are key factors for a project's success. DomainSpecific Languages (DSLs) being simple, highly-focused and tailored to a clear problem domain are a promising alternative to heavy-weight modeling approaches in the field of Web Engineering. Thus, they enable stakeholders to validate, modify and even develop parts of a distributed Web-based solution. Categories and Subject Descriptors D.2.13 [Software Engineering]: Reusable Software - Domain Engineering; D.2.2 [Software Engineering]: Design Tools and Techniques - Evolutionary prototyping; General Terms Human Factors, Languages, Design Keywords Web Engineering, DSL, Web Services, Conceptual Modeling