Control ownership is the assignment of roles and responsibilities for the design, implementation, monitoring, and improvement of controls that mitigate risks. Control ownership can help ensure that the controls are effective, efficient, and aligned with the business objectives and risk appetite. Control ownership can also help facilitate the communication, coordination, and accountability among the stakeholders involved in the risk management process. One of the factors that would present the greatest challenge when assigning accountability for control ownership is unclear reporting relationships. Reporting relationships are the formal or informal lines of authority and communication that define who reports to whom, and who is accountable for what. Unclear reporting relationships can create confusion, ambiguity, and conflict among the control owners and other stakeholders, such as the risk owners, the business owners, the auditors, the regulators, etc. Unclear reporting relationships can also hinder the performance evaluation, feedback, and recognition of the control owners, and affect their motivation and commitment. Unclear reporting relationships can also increase the risk of duplication, inconsistency, or gaps in the control activities, and compromise the quality and reliability of the control environment. References = Defining, Assigning and Measuring: Accountability Challenges in 21st Century Governance, CRISC 351-400 topic3, Foundations of Project Management : Week 2.