Secure Web Services are a critical requirement for many enterprises. However, until now, it has been impossible to have Web services that are both interoperable and secure. With multiple standards and a growing array of Web services security methods, it is becoming more difficult to ensure that service-to-service interactions are both interoperable and protected from the unscrupulous. That's why WS-I (www.ws-i.org) continues to make security a top priority in its efforts to promote greater Web services interoperability.