I found that when limited to identifying individual business use cases to
"support" business goals, that one of our less experienced use case analysts
ended up creating what are effectively bogus top-level business use cases to
simplify the model. The bogus business use cases serve only as a node to
connect the business goals with multiple "real" business use cases, i.e.,
the top level business use case can't really be described as a meaningful
scenario in and of itself -- it's really just a passive "connector" to a
collection of artificially included business use cases that are doing the
real "support" of the business goal.