segregation of duties

https://segregationdutieslab.almoheet-travel.com/why-segregation-of-duties-is-your-first-defense-against-purchasing-fraud

Segregation of duties is a key internal control that prevents any single person from having too much power over a process. For example, the person who approves a payment shouldn't be the same one who initiates it. This reduces the risk of errors and fraud, because it requires collusion to bypass the checks. It's used in everything from corporate expense reports to government grant oversight, making processes more transparent and accountable.