Adapting plans and estimates to changing customer needs and maximizing value at an affordable cost are the planning imperative for agile projects - paraphrased from "Timeline, Getting and Keeping Control Over Your Project," Malotaux, Annual Pacific Northwest Software Conference, Portland, OR, 2008 in Project Management the Agile Way: Making it Work in the Enterprise, John Goodpasture.
Planning is everything. Plans are Nothing, No Plan survives contact with [reality] - Field Marshall Helmuth Graf von Moltke
