ZBB(Zero Bug Bounce)

http://www.refocuser.com/2009/04/bouncing-at-zero-zbb-in-life/

It’s called Zero Bug Bounce (ZBB) and it refers to a period in time in which the development team is consistently “bouncing at zero bugs” every single day. At this point in the project, all active bugs in the software have been looked at and either punted or fixed – and the team’s fix rate (or the rate at which they’re able to fix bugs) is greater than the team’s incoming rate (or the rate at which new bugs are being opened).