An economic rectification plan for a process subject to a random shift into a persistent defective state

A rectification strategy is considered for a process which is subject to a random shift into a persistent defective state. The expected costs associated with plans other than the basic retrospective unit by unit procedure are considered and a simple criterion is derived to identify that with approximate minimum expected cost. The validity of the application is discussed and an example is given to illustrate the inductive nature and simplicity of the technique.