The AddOn Business Process View takes results of the single nagios checks out
of NDO (Nagios' database) and builds up aggregated states. How they are
associated is described in one or more config files. There is the possibility
to make "and" conjuctions, "or" conjunction and other...

A business process (as defined by such a formula) can be used as a part of
another business process. So You can build up a hirachical structure to
describe the state of Your Application.