On the use of weighted sums in the definition of measures

A number of measures have been defined in ESE by using weighted sums. For instance, several widely used functionality measures and quality models are defined by using weighted sums. Despite the apparent simplicity in the definition and in the interpretation of those measures, there are a few inherent problems that may make them quite problematic. This paper provides a critical investigation about the theoretical and empirical validation pitfalls of weighted sums that may make them unsuitable for the definition of meaningful and practically useful measures.