UML for Cake

Being a big fan of Frank Brooke's "Mythical Man Month" and other trends in Software Engineering.I feel obliged as a corporate developer to introduct UML to our Web Developer Department.The reasons being:
Documentation

• A need for proper standardized documentation
• A graphical means of representing all facets of a Cake application

Architecture
In the pre-implementation stage when the boss issues the requirements document which briefly outlines what he expects of the application.The developers should don their architecture/system-analyst hats and :

• Beat the potential bugs & loopholes out of the requirements
• Submit their 'requirements' document to the boss for confirmation
• Start designing the application in either
• Top-Down method
• Bottom-Up method
• Outline the architecture of such a system : 1 layer at a time