System and method for integrating Web Services using a Web Services Structured Methodology are described. Embodiments of a Web Services Structured Methodology may be used to integrate Web Services in Enterprise and Cross-Enterprise business systems, and to integrate legacy systems (e.g. legacy mainframe systems) with Web Services in Enterprise and Cross-Enterprise business systems. Embodiments may provide an integrated Web Services architecture design mechanism that may be used for Enterprise and Cross-Enterprise integration of Web Services. Embodiments may be used for Legacy Mainframe Integration and Interoperability with Web Services.