Inter-organizational exchange of personal information raises significant challenges in domains such as healthcare. First, trust among parties is not homogenous; data is shared according to complex relations. Second, personal data is used for unexpected, often divergent purposes. This tension between information need and provision calls for custom services whose access depends on specific trust and legal ties. Current Web services are "one-size-fits-all" solutions that do not capture nuanced relations nor meet all users' needs. Our goal is providing computation-enabled services which: (a) are accessible based on providers' policies, and; (b) allow user-controlled customization within the authority granted. We present our proposed solutions in COASTmed, a prototype for electronic health record (EHR) management which leverages novel architectural principles and formal policies.
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