A theory of explanation might treat explanations in either a realist or an epistemic (that is, anti-realist) sense. A realist interpretation of explanation holds that the entities or processes an explanation posits actually exist--the explanation is a literal description of external reality.
Officers in pay grades O-1, O-2, and O-3 with more than four years of prior cumulative service in an enlisted or warrant officer grade are paid increased wages using the special pay grades of O-1E, O-2E, and O-3E, respectively.
Consistency. A salary range gives companies a system to pay employees consistently for the work they do in a given position. The range usually allows for differences in education, experience or performance. However, employees in the same type of job know they earn pay that is relatively similar to colleagues. salary range is a part of a structured pay system in which pay is based on the educational and experiential requirements for a given job.