How can you achieve loose coupling in a SOA?

Using the service interface (the WSDL for a SOAP Web Service) to reduce this reliance and hide the service implementation from the user is one method for achieving loose coupling. Loose coupling can be handled by encapsulating service functionality in such a way that changes to the implementation have a limited influence on the service interface.

However, you will need to manage various security restrictions, multiple means of transport, and other concerns at some time, as well as alter the interface and manage versioning without affecting service users.