 The percentage of the known bugs not found gives an indication of the real bugs that remain.The term "bebugging" was first mentioned in "The Psychology of Computer Programming" (1970), where Gerald M. Weinberg described the use of the method as a way of training, motivating, and evaluating programmers, not as a measure of faults remaining in a program.The approach was borrowed from the SAGE system, where it was used to keep operators watching radar screens alert.