The design of Interactive TV services is in an experimental phase. The design of these services needs a more structured approach that enables the actors involved to cooperate and develop a successful service. Based on a Service System design approach we used a framework to analyze an I-TV banking service. The case study shows the barriers to adoption in the current design approach. To deal with these barriers we propose to focus on adoption in the design approach for I-TV banking services. Categories and Subject Descriptors H 4.3 [Information Systems applications]: Communication applications. General Terms: Design.