  We give a new proof of the global stability of Minkowski space originally
established in the vacuum case by Christodoulou and Klainerman. The new
approach shows that the Einstein-vacuum and the Einstein-scalar field equations
with general asymptotically flat initial data satisfying a global smallness
condition produce global (causally geodesically complete) solutions
asymptotically convergent to the Minkowski space-time. The proof utilizes the
classical harmonic (also known as de Donder or wave coordinate) gauge.
