Specifying non-functional requirements (NFRs) is a complex task, being usually addressed during the latter phases of the software development process. The late inclusion of NFRs during the software development may compromise the quality of the resulting application. This paper presents πSOD-M, a method and associated tools that: i) allow the early specification of NFRs allowing users to them in an abstract way without having to care about low-level details; ii) embraces the model-driven architecture (MDA) philosophy, generating models (code) whenever possible for reducing the specification and programming effort of the business application logic and its associated NFRs. Our solution has been used in the context of an industrial and real case study.