  The ability to develop or evolve software or software-based systems/services
with defined and guaranteed quality in a predictable way is becoming
increasingly important. Essential - though not exclusive - prerequisites for
this are the ability to model the relevant quality properties appropriately and
the capability to perform reliable quality evaluations. Existing approaches for
integrated quality modeling and evaluation are typically either narrowly
focused or too generic and have proprietary ways for modeling and evaluating
quality. This article sketches an ap- proach for modeling and evaluating
quality properties in a uniform way, without losing the ability to build
sufficiently detailed customized models for specific quality properties. The
focus of this article is on the description of a multi-criteria aggregation
mechanism that can be used for the evaluation. In addition, the underlying
quality meta-model, an example application scenario, related work, initial
application results, and an outlook on future research are presented.
