I suggested instead that during sprint planning, the team should strive to identify only about two-thirds of the tasks the team will eventually perform during the sprint. That would leave about one-third of the tasks to be identified during the sprint.
The Time Traveller (for so it will be convenient to speak of him) was expounding a recondite matter to us. His pale grey eyes shone and twinkled, and his usually pale face was flushed and animated...