Having an acceptance criteria checklist is an essential part of ensuring the successful completion of any task or project. It serves to define and clarify expectations, prevent miscommunication, and increase the probability of success. By having a clear set of criteria that must be met in order for a task or project to be considered complete, it helps ensure that all stakeholders are on the same page regarding what they are trying to achieve, how they plan to do it, and when they expect it will be done.