The document discusses the role of a Chief Data Officer (CDO) and how data architecture can help support that role. It provides examples of what BT is doing with data in the absence of a CDO, including building a data platform called HAAS to centralize data and facilitate self-service analytics. The challenges of BT's complex legacy systems are also outlined. Data architecture helps by developing a vision, building the data infrastructure platform, and educating others on its use to support data-driven initiatives without a formal CDO.