This paper is an attempt to renovate the old concept of “crime occurrence” and “crime apprehension,” which have been used for more than fifty years without any serious investigation in Korea. After reviewing similar concepts used in Japan and the US, we introduced new concepts: “discovery” and “clearance” replacing occurrence and apprehension. We also found the current calculation of the concepts such as apprehension rate are illogical and suggested the new formula should be used in order to communicate the meaning of the concepts as intended.