While service-oriented architecture (SOA) as an architectural principle for information systems is gaining momentum in research and industry, the field of methods for designing information systems according to SOA is still poorly developed. However, the implementation of SOA design principles, e.g. service reusability, business alignment and autonomy, demands a methodical approach. In order to overcome the shortcomings of current methods, authors developed the SOA method (SOAM), presented in this paper.