Abstract: A monitoring system includes a first storage device and a processor. The first storage is configured to temporarily store a first iterated value corresponding to first history parameters. The processor is configured to receive first parameters of first products tested by a test machine, generate a second iterated value by performing an iterative calculation of the first parameters and the first iterated value, and update the first iterated value temporarily stored in the first storage device to the second iterated value for follow-up iterative calculations to selectively output an alert information, wherein the second iterated value corresponds to the first parameters and the first history parameters.