My paper on Service Oriented Security Architecture from the Nov. issue of ISB is now online. The paper describes an approach to dealing security design and architecture issues in developing Web Services and SOA software.The primary goals are to illustrate a set of key analytical areas, and a way to synthesize these relationships. As Kruchten and others observed separation of concerns is an useful technique in software architecture. In security architecture, it is useful as well, and in addition separation of assets yields a more robust risk management model. In the case of this paper, the assets are separated as Identity, Message, Service, Deployment Environment, and Transaction. This way the risks and countermeasures can be understood and the elements and constraints dealt with in their own domain to the extent possible.