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In the Internet of Services, users are surrounded by lots of connected devices and remote services with the potential for real-time interaction. While users could manually command their operation, it will be extremely convenient to have an environment where interaction workflows could easily be defined so that services could operate autonomously following those patterns. This article presents a system to allow individuals with no specific programming skills to define and execute those interaction workflows using graphical abstractions. The system has been validated inside a smart home scenario, as a good representative of the future Internet of Services environment due to the presence of multiple heterogeneous devices and services from different domains.