Using SOAP without WSDL Hard to do, requires good knowledge of SOAP library WSDL parsing is still being developed, hand coding can be more interoperable SOAP libraries that use WSDL Very easy to use, but most SOAP libraries do not handle WSDL well enough yet Slow, library must parse WSDL on every instance Generating Proxies for robust Web Services Tools can take their time analyzing WSDL to generate robust proxy classes that increase interoperability.