This presentation was part of the First International Workshop on Software Architecture Metrics, held at the 11th Working IEEE/IFIP Conference on Software Architecture.
The architecture of a software system plays a crucial role during evolution and maintenance, as it provides the means to cope with the inherent system complexity by abstracting from implementation and design details. Architectural component models represent high-level designs and are frequently used as a central view of architectural descriptions of software systems. Hence, understandability of those models is crucial as they play a key role in supporting the architectural understanding of a software system. In this paper, we present the results from a study we carried out to examine to what extent the software architecture could be conveyed through architectural component diagrams. The statistical evaluation of the results shows that metrics such as the number of components, number of connectors, number of elements, and number of symbols used in the diagrams can significantly decrease architectural understandability when they are above and below a certain roughly predicted threshold. Also, our results indicate that architectural understandability is linearly correlated with the perceived precision and general understandability of the diagrams.