FTA, severity reflects "a bug’s impact to the functionality of the system", while priority reflect the "client’s business and product requirements". The point

FTA, severity reflects "a bug’s impact to the functionality of the system", while priority reflect the "client’s business and product requirements". The point of this system is that high-severity bugs might have lower priority than low-severity bugs if you take business requirements into consideration. Yet, this does not mean that severity should be ignored.