According to the CRISC Review Manual1, impact assessment is the process of identifying and evaluating the potential effects of changes to IT services on the organization's business objectives, processes, resources, and risks. Impact assessment is essential for ensuring that the changes are aligned with the organization's strategy, goals, and risk appetite, and that the benefits of the changes outweigh the costs and risks. Impact assessment also helps to prioritize, plan, and implement the changes effectively and efficiently, and to monitor and measure the outcomes of the changes. Therefore, the most important factor for a risk practitioner to consider when evaluating plans for changes to IT services is the impact assessment of the change. References = CRISC Review Manual1, page 224.