The RACI matrix is a tool that requires careful planning, execution, and maintenance, but it can come with some challenges. Defining the tasks or deliverables can be difficult if they are complex, interdependent, or changing. You may need to break down the tasks into smaller and manageable units and align them with the program objectives and scope. Similarly, defining the roles or individuals can be hard if they are diverse, dispersed, or dynamic. You may need to map out the roles or individuals based on their functions, levels, or interests and update them as the program evolves. Assigning the RACI categories to each task and role can be challenging if they are overlapping, conflicting, or unclear. It’s important to consult and negotiate with the persons or roles involved and ensure that each task or deliverable has only one accountable person or role and the right balance of responsible, consulted, and informed persons or roles. Finally, validating and communicating the RACI matrix can be tricky if there are disagreements, misunderstandings, or resistance. You may need to explain and justify the RACI matrix, seek feedback and approval from those affected by it, and communicate it clearly and regularly.