Structural equation modeling, as the term is currently used in sociology, psychology, and other social sciences evolved from the earlier methods in genetic path modeling of Sewall Wright. Their modern forms came about with computer-intensive implementations in the 1960s and 1970s. SEM evolved in three different streams: (1) systems of equation regression methods developed mainly at the Cowles Commission; (2) iterative maximum likelihood algorithms for path analysis developed mainly by Karl Gustav Jöreskog at the Educational Testing Service and subsequently at Uppsala University; and (3) iterative canonical correlation fit algorithms for path analysis also developed at Uppsala University by Hermann Wold. Much of this development occurred at a time that automated computing was offering substantial upgrades over the existing calculator and analogue computing methods available, themselves products of the proliferation of office equipment innovations in the late 20th century. The 2015 text "Structural Equation Modeling: From Paths to Networks" provides a history of the methods.