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Control Charts:
A control chart provides a basis for deciding whether the variation in the output is due to common causes (in control) or assignable causes (out of control). Whenever an out-of control situation is detected, adjustments or other corrective action will be taken to bring the process back into control.Control charts can be classified by the type of data they contain.
(D.R.Anderson, D.J.Sweeney,T.A.Williams, Statistics for Business and Economics, pg.852)

Component Cost:
The components of a product (also simply called parts of the product) may include standart parts purchased from suppliers. Exampes of standart components include motors, switches, electronic chips, and screws. Other components are custom parts, made according to the manufacturer's design from raw materials, such as sheet steel, plastic pellets, or aluminium bars. Some custom components are made in the manufacturer's own plant, while others may be produced by suppliers according to the manufacturer's design specifications.
(S.Kalpakjian, S.R.Schmid,Manufacturing Engineering and Technology,5th editon, pg.214-215)

Operating System:
An operating system is a program that manages the computer hardware. It is also provides a basis for application programs and act as an intermediary between a user of a computer and and the computer hardware. An amazing aspect of operating systems is how varied they are in accomplishing these tasks. Mainframe operating systems are designed primarily to optimize utulization of hardware. Personal Computer (PC) operating systems support complex games, business application, and everything in between. Hand-held computer operating systems are designed to provide an environment in which a user can easily interface with the computer to execute programs. Thus, some operating systems are designed to be convenient, others to be efficient, and some others combination of two.
(S.Kumar, Encyclopaedia of Operatin System, pg.1)

Harmonic Distortion:
Harmonic distortion is another common paremeter used in the specifications of audio systems. Such the distortion is the result of so called 'non linearity' within a device- in other words, when there is not a 1:1 relationship between what comes out of the device and what went in, when looked at over the whole signal amplitude range.
(F.Rumsey, T.McCormick, Sound and Recording,pg.579)