"There has been a missing piece in our new culture of knowledge work: a system with a coherent set of
behaviors and tools that functions effectively at the level at which
work really happens. It must incorporate the results of big-picture
thinking as well as the smallest of open details. It must manage
multiple tiers of priorities. It must maintain control over hundreds of
new inputs daily. It must save a lot more time and effort than are
needed to maintain it. It must make it easier to get things done." David Allen (Quellenangabe)