New technology may be evaluated either by comparison with prior methods or by studying the requirements which led to its development. Several post-war advances permitted the development of digital technology. The first was the advent of statistical communication theory and its application to geophysical data by the Geophysical Analysis Group at M.I.T. The next involved the techniques for recording high-volume seismic data in digital format. Hardware and software were then combined applying statistical communication theory to the solution of complex seismic problems.

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