“[T]he successes of modern control theory in the design of highly accurate space navigation systems have stimulated its use in the theoretical analyses of economic and biological systems. Similarly, the effectiveness of computer simulation techniques in the macroscopic analyses of physical systems has brought into vogue the use of computer-based econometric models for purposes of forecasting, economic planning, arid management.”

—  Lotfi A. Zadeh

Source: 1970s, Outline of a new approach to the analysis of complex systems and decision processes (1973), p. 28

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Lotfi A. Zadeh 18
Electrical engineer and computer scientist 1921–2017

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Lotfi A. Zadeh photo

“The advent of the Computer age has stimulated a rapid expansion in the use of quantitative techniques for the analysis of economic, urban, social, biological and other types of systems in which it is the animate rather than in dominant role. At present, most of the techniques employed for the analysis of humanistic, i. e., human centred systems are adaptations of the methods that have been developed over a long period of time for dealing with mechanistic systems, i. e., physical systems governed in the main by-the laws of mechanics, electromagnetism, and thermodynamics. The remarkable successes of these methods in unraveling the secrets of nature and enabling us to build better and better machines have inspired a widely held belief that the same or similar techniques can be applied with comparable effectiveness to the analysis of humanistic systems.”

Lotfi A. Zadeh (1921–2017) Electrical engineer and computer scientist

Source: 1970s, Outline of a new approach to the analysis of complex systems and decision processes (1973), p. 28

“This report summarizes the activities of the M. I. T. Computer-Aided Design (CAD) Project from 1 December 1959 through 3 May 1967 in the development of a generalized 'system of software systems' for generating specialized problem-solving systems using high-level language techniques and advanced computer graphics. Known as the AED Approach (for Automated Engineering Design) the Project results are applicable not only to mechanical design, as an extension of earlier development of the APT System for numerical control, but to arbitrary scientific, engineering, management, and production systems as well.”

Douglas T. Ross (1929–2007) American computer scientist

D.T. Ross & John Erwin Ward (1968). Investigations in computer-aided design for numerically controlled production http://dspace.mit.edu/bitstream/handle/1721.1/755/FR-0351-19563962.pdf?sequence=1. Electronic Systems Laboratory, Electrical Engineering Dept., Massachusetts Institute of Technology. p. iii Abstract.

“Business System Planning (BSP) and Business Information Control Study (BICS) are two information system planning study methodologies that specifically employ enterprise analysis techniques in the course of their analysis. Underlying the BSP and BICS analysis are the data management problems that result from systems design approaches that optimize the management of technology at the expense of managing the data.”

John Zachman (1934) American computer scientist

Source: Business Systems Planning and Business Information Control Study: A comparison, 1982, p. 31

Béla H. Bánáthy photo

“Systems inquiry has demonstrated its capability in dealing effectively with highly complex and large-scale problem situations. It has orchestrated the efforts of various disciplines within the framework of systems thinking. It has introduced systems approaches and methods to the analysis, design, development, evaluation, and management of systems of all kinds”

Béla H. Bánáthy (1919–2003) Hungarian linguist and systems scientist

Source: Systems Design of Education (1991), p. 31 as cited in: K.C Laszlo (1998) Dimensions of Systems Thinking http://archive.syntonyquest.org/elcTree/resourcesPDFs/Systems_Thinking.pdf. Working paper on syntonyquest.org

Donald A. Norman photo

“When I use a direct manipulation system—whether for text editing, drawing pictures, or creating and playing games—I do think of myself not as using a computer but as doing the particular task. The computer is, in effect, invisible. The point cannot be overstressed: make the computer system invisible.”

Donald A. Norman book The Design of Everyday Things

Source: The Design of Everyday Things (1988, 2002), Ch. 6, p. 185.

“Simulation is the use of models and/or the actual conditions of either the thing being modeled or the environment in which it operates, with the models or conditions in physical, mathematical, or some other form. The purpose of simulation is to explore the various results which might be obtained from the real system by subjecting the model to representative environments which are equivalent to, or in some way representative of, the situations it is desired to understand or investigate. Simulation may involve system hardware and the actual physical environment, or it may involve mathematical models subjected to mathematical forcing or disturbance functions representative of the systems conditions to be studied.”

Harold Chestnut (1917–2001) American engineer

Source: Systems Engineering Tools, (1965), p. 111 as cited in

Neil Armstrong photo

“Space has not changed but technology has, in many cases, improved dramatically. A good example is digital technology where today's cell phones are far more powerful than the computers on the Apollo Command Module and Lunar Module that we used to navigate to the moon and operate all the spacecraft control systems.”

Neil Armstrong (1930–2012) American astronaut; first person to walk on the moon

On the differences between the present and the time of the space race which existed during the Cold War years, in an interview at The New Space Race (August 2007)

“Models are used essentially for evaluation and prediction purposes as well as for the analysis and study of the different parts of the system so that the systems engineer or designer may arrive at sound engineering decisions regarding the system design.”

Harold Chestnut (1917–2001) American engineer

Source: Systems Engineering Tools, (1965), p. 113; As cited in: Alberto Ortiz (1992, p. 12-13)

“General Systems Theory is a name which has come into use to describe a level of theoretical model-building which lies somewhere between the highly generalized constructions of pure mathematics and the specific theories of the specialized disciplines. Mathematics attempts to organize highly general relationships into a coherent system, a system however which does not have any necessary connections with the "real" world around us. It studies all thinkable relationships abstracted from any concrete situation or body of empirical knowledge.”

Kenneth E. Boulding (1910–1993) British-American economist

Source: 1950s, General Systems Theory - The Skeleton of Science, 1956, p. 197: Opening sentences

“Creating a modeling language that is also an executable language has long been a goal of the software community. Many years ago, in 1968 to be exact, while working with software components to successfully develop a telecommunications system, we created a modeling language that was the forerunner to UML. To model components we used sequence diagrams, collaboration diagrams, and state transition diagrams (a combination of state charts and activity diagrams). Our modeling language then seamlessly translated the component models into code. Each code component was in its turn compiled into an executable component that was deployed in our computer system. The computer system was a component management system—thus we had "components all the way down."”

Stephen J. Mellor (1952) British computer scientist

Source: Executable Uml: A Foundation for Model-Driven Architecture, 2002, p. xxiii: Foreword.

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