Description: Maintainability of an object, determined by engineering design under expected maintenance conditions and logistical support; Name: Inherent maintainability
Description: maintainability of an item determined by the design under expected conditions of maintenance and logistic support; Name: intrinsic maintainability
Description: input variable to a comparing element in a controlling system, which sets the desired value of the controlled variable and is deducted from the command variable; Name: reference variable