One of the tasks while doing EA is to collect relations between different enterprise assets (Roles, Units, Goals, Objectives, Business Capabilities, Information Objects, Entities, Applications, Products, Databases, Technologies, etc'). If the data already captured and maintained why won't we use it for a common task such as project estimation?
The above example is generated automatically from IBM System Architect. The user may drag and drop any IT assets and by using a macro generate all of the asset related building blocks (with lines that resemble the relation). Having all the related impacted or influenced building block on the diagram the user can enter, for each building block, estimated working days that needed to be done for the given change. The tool will generate automatically a project plane taking in account all of the related building blocks, the type of relations and man days assigned to each building block.
The results give you immediate estimation about the project duration. If you want you can go back to the diagram change durations or set two building blocks to be run in parallel, and rerun the macro to see how your changes impact the project duration.