“The British did not have quite the same respect for the ‘scientific’ calculation of requirements that the Americans at least professed to have, and regarded the end result as merely an educated guess. It is at least possible that American insistence that the British determine their requirements far in advance was also conditioned less by their confidence in anybody’s ability to do so than by their desire to keep production plans stable and not allow them to be continually disrupted by British demands for bits and pieces.” – Robert W. Coakley and Richard M. Leighton, “Lend-Lease and the Common Pool,” Global Logistics and Strategy: 1943-1945