Recall from Chapter 3 that enterprise architecture describes the blueprint of the information technology and organizational resources that are used to execute business processes. At what stage in the systems development life cycle do stakeholders determine the architecture they will use to build an information system? What is SOA? Visit YouTube.com and search for "infoclipz: service oriented architecture." View this three-minute video by Info World and prepare a brief summary that includes a discussion of the benefits and challenges of SOA.