Many organizations choose to implement one management system standard at a time, building off the structure of the previous system implementation and lessons learned. This approach is sound but the key to the success is to implement the management system's standard with the most rigorous and extensive requirements first (ISO 9001). If this is done, all additional management systems can utilize the pre-existing systems in place (e.g. document control, record control, management review, corrective/preventive action, internal audits) then add only the specific requirements of that management system (e.g. aspects, impacts, external communication). This technique reduces redundancy and inefficiency, saving time and resources, which usually equates to saving money.