Abstract
It might be not in time for the delivery date in the project by actualizing the hazard. Bugs are those typical examples however; it is very difficult for PM to exclude tens of bugs including the probability bug that relapses very low in immediately before delivery date. The author reported on seven bug shooting technologies that were able to apply also to the bug with a little reproducibility. When the bug classification management method is applied based on a group according to a technical cause, a group according to managed cause, and an insufficient process quality cause patterns, it is effective.
