The most effective way for a CIO to govern business unit deployment of shadow IT applications in a cloud environment is to educate the executive team about the risk associated with shadow ITapplications. This is because shadow IT applications are often deployed without the knowledge or approval of the central IT organization, and may pose security, compliance, and performance risks to the enterprise. By raising awareness of these risks among the executive team, the CIO can foster a culture of IT governance and alignment, and encourage the business units to follow the established application implementation process. References: CGEIT Certification | Certified in Governance of Enterprise IT | ISACA1, IT Governance: Definitions, Frameworks and Planning - ProjectManager2