SOA project with Enterprise Architecture

Service Description

SOA projects using Enterprise Architecture -How to balance between granularity of “Business Activity” and a Service description)? -How to trace Functional Requirement and Service? -How to identify and model Non-Functional Needs for Service? -How to generate multiple technology specific code/script from architecture model? -How to do impact analysis (directly and indirect associated/referenced artifacts) for a “Service" change request” without referring code?