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.
A pay grade or salary grade scale is a structured pay format where new employees are placed at a given pay level based on their level of education and work experience related to the position.urpose. Pay grade schedules have increased in prominence in the early 21st century. The federal government has a system known as the General Schedule in place for all federal jobs. Many private sector employers use them as well.