PriEsT is an acronym for 'Priority Estimation Tool' which is an open-source decision-making software that implements the Analytic Hierarchy Process (AHP) method - a comprehensive framework for decision problems. PriEsT can assist decision makers in prioritizing the options available in a given scenario.

A priest or priestess (feminine) (from  Greek πρεσβύτερος presbýteros through Latin presbyter, "elder", or from Old High German priast, prest, from Vulgar Latin "prevost" "one put over others", from Latin praepositus "person placed in charge"), is a person authorized to perform the sacred rituals of a religion, especially as a mediatory agent between humans and one or more deities. They also have the authority or power to administer religious rites; in particular, rites of sacrifice to, and propitiation of, a deity or deities. Their office or position is the priesthood, a term which also may apply to such persons collectively.