The proposed HEA is based on the assumption that each specific error has a certain impact on a system/aircraft state whilst the crew's likeliness to commit this error is decreasing with an increasing number of safeguards against it.
Source: wiktionary
To determine the likeliness of an individual in a concept, a membership function is required.
Source: wiktionary
A new competitor may decrease the likeliness of an old hypothesis, but it will usually not change its loveliness.
Source: wiktionary
No surely, Reason is both the Gift and Image of God, and every Degree of its Improvement is a farther Degree of Likeliness to him.
Source: wiktionary