On Service-Oriented Architecture (SOA) delivery projects, practitioners concern themselves with the characteristics of good services and how such services can be designed. For instance, they look for advice regarding interface granularity and criteria to assess whether existing software assets are fit for reuse in SOA environments. In this paper, we position architectural decision modeling as a prescriptive service realization technique. We propose a multidimensional SOA decision catalog, separating platform-independent from platform-specific concerns and supporting dependency management. The catalog is positioned in a three-stage model transformation chain for SOA.