SADT has been developed and field-tested during the period of 1969 to 1973<ref name="sadt"/> by [[Douglas T. Ross]] and [[SofTech, Inc.]].<ref name="sadt"/> The methodology was used in the MIT [[APT (programming language)|Automatic Programming Tool]] (APT) project. It received extensive use starting in 1973 by the US Air Force [[Integrated Computer Aided Manufacturing]] program. It is part of a series of structured methods, that represent a collection of analysis, design, and programming techniques that were developed in response to the problems facing the software world from the 1960s to the 1980s. In this timeframe most commercial programming was done in [[Cobol]] and [[Fortran]], then [[C]] and [[BASIC]]. There was little guidance on “good” design and programming techniques, and there were no standard techniques for documenting requirements and designs. Systems where getting larger and more complex, and the information system development became harder and harder to do so. As a way to help manage large and complex software. Since the end 1960 multiple Structured Methods emerged<ref name="DL00" >Dave Levitt (2000):[http://faculty.inverhills.edu/dlevitt/CS%202000%20(FP)/Introduction%20to%20Structured%20Analysis%20and%20Design.pdf Introduction to Structured Analysis and Design]. Retrieved 21 Sep 2008.</ref>
* [[Structured programming]] in circa 1967 with [[Edsger W. Dijkstra]].
