Speculate" gives us room to explore, to make clear the realization that we are unsure, to deviate
from plans without fear. It doesn't mean that planning is obsolete, just that planning is
acknowledgeably tenuous. It means we have to keep delivery iterations short and encourage
iteration. A team that "speculates" doesn't abandon planning, it acknowledges the reality of
uncertainty. Speculation recognizes the uncertain nature of complex problems and encourages
exploration and experimentation. We can finally admit that we don't know everything