Iterative development of services may be provided by simultaneously developing service implementations and the corresponding WSDL description. At least one web service may be specified by WSDL code accepted as input. Output code may be created corresponding to each of the inputted web service. A graphical display item may be displayed corresponding to each inputted web service. The WSDL code, output code, and graphical display may be updated to reflect user input modifying a web service. A WSDL document and/or an output code document may be generated including modified web services.