motivations behind technological choices. It is able to describe how socially and politically conditioned technological institutions become independent and autonomous over time. Notes References Thomas P. Hughes, "The Evolution of Large Technological Systems," in Wiebe E. Bijker, Thomas P. Hughes, and Trevor Pinch, eds., The Social Construction of Technological Systems: New Directions in the Sociology and History of Technology, 2012 (1987), pp. 45-76. Thomas P. Hughes, "Technological momentum," in Albert Teich, ed., Technology and the Future, 8th edn., 2000. Thomas P. Hughes, "Technological momentum," in Merritt Roe Smith and Leo Marx, ed., Does Technology Drive History?: The Dilemma of Technological Determinism, Massachusetts Institute of Technology, 1994, pp. 101–113 Thomas P. Hughes, "Technological Momentum in History: Hydrogenation in Germany 1898-1933", Past and Present, No. 44 (Aug., 1969), pp. 106–132 History of technology Technological change