(Reference) Architecture = Components + Composition (+ Variation Points)? Kung-Kiu Lau and Simone Di Cola School of Computer Science The University of Manchester Manchester M13 9PL, United Kingdom kung-kiu,dicolas@cs.manchester.ac.uk Abstract: The notions of architecture, component and composition are perceived differently in different communities. In order to discuss how component-based development can contribute to the definition and use of reference architecture in practice, in this position paper, we outline some fundamental char- acteristics of components and composition and posit their relevance to reference architecture.