SOA and EAI metrics

How do you estimate the size of SOA or EAI projects?

I am not a metric expert, but I think use case point (UCP) and function point (FP) are not suitable for SOA and EAI.

UCP and FP are referring to the users view of system rather than a technical aspect. SOA and mainly EAI are not about the users view of systems. They are more about system and information architecture.

It is very bad not to have a method to measure the project’s product. Without a metric method it is impossible to benchmark the performance of the team.

Maybe an expert can determine how apply FP concepts, for example, in an EAI scenario.

Please, let me know what method you use to measure your EAI or SOA projects.