Composers, on the other hand, require a different mentality and social breeding. Rather than thinking in terms new application logic development, composers think in terms of configuration of existing Services as reflecting the then-current needs of the business. Composers depend on models for their basic, day-to-day operation. Since the models that drive Service composition necessarily reflect the actual requirements of the business, composers can not even accomplish their daily goals and tasks the artifacts that developers would consider unnecessary documentation. Developers desire working code over extraneous models. Composers need working models over extraneous code."