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As a result of the proliferation of Web 2.0 style Web sites, the practice of mashup services has become increasingly popular in the Web development community. While mashup services bring flexibility and speed in delivering new valuable services to consumers, the issue of accountability associated with the mashup practice remains largely ignored by the industry. Furthermore, realizing the great benefits of mashup services, industry leaders are eagerly pushing these services into the enterprise arena. Although enterprise mashup services hold great promise in delivering a flexible SOA solution in a business context, the lack of accountability in current mashup solutions may render this ineffective in the enterprise environment. This paper defines accountability for mashup services, analyses the underlying issues in practice, and finally proposes a framework and ontology to model accountability. This model may then be used to develop effective accountability solutions for mashup environments.