Take average criteria compared with those derived by the concept, to know the level of performance. Design and development of the work-book rental shops (Best, 1981:24):
The average has been compared to the concept. To determine the appropriate level of system performance Design and development, book rental stores (Best, 1981: 24) as follows.
The average as compared with the standard according to the concept. In order to realize the efficiency level to the system. System design and development, book shop (Best 1981: 24) as follows.