From the Berlin "ENTWURF" Field Equations to the Einstein Tensor I:   October 1914 until Beginning of November 1915
  I discuss Albert Einstein's 1914 review paper, "The Formal Foundation of the General Theory of Relativity" from two points of view: the main elements in the paper that appear to have led to the downfall of the Einstein-Grossman theory; and the elements that seem to have inspired Einstein during October 1915 to reformulate the 1914 Einstein-Grossmann theory in the form of the November 1915 and the 1916 General Theory of Relativity. First paper among three papers. 
Galina Weinstein
physics.hist-ph