We will refer to such analysis methods as being
horizontal methods. We believe that apart from the classical horizontal methods we
must expose vertical methods that work across multiple domains. We anticipate that
such methods must focus on the ‘used by’ and ‘realisation’ relations bridging the
different architectural domains. Nevertheless, the distinction between horizontal
and vertical methods must not be considered restrictive at all, since (as it will also
result from the example we are giving) the two types of methods can be combined,
such that the output (i.e., calculated performance measures) of one type of method
will provide the input quantities for another ‘follow-up’ analysis method.