Source: Putting systems to work (1992), p. 6; as cited in: Stuart Anderson (2006) "Heterogeneous Modelling of Evolution for Socio-technical Systems"
“An example from soft systems thinking is Checkland's appreciation of soft systems methodology. He wants to introduce hard systems approaches to deal with hard problems only after and through a soft systems analysis.”
Robert L. Flood (1993) Dealing with Complexity: An Introduction to the Theory and … - Pagina 127.
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Robert L. Flood 12
British organizational scientist 1959Related quotes

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

Ackoff (1999). "Disciplines, the two cultures and the scianities". Systems Research and Behavioral Science. 16 (6), p. 537. Cited in: Sherryl Stalinski (2005) A Systems View of Social Systems, Culture and Communities. Saybrook Graduate School. p. 5.
1990s
Source: Two Hundred Million Americans in Search of a Government (1969), p. 24
Michael C. Jackson (1992) Systems Methodology for the Management Sciences. p. 74; About A.D. Hall (1962)
“There seem to be two fundamental schisms in thinking: the hard/soft and the open/closed.”
Source: Putting systems to work (1992), p. 6

Cited in: Haluk Demirkan, James C. Spohrer, Vikas Krishna (2011) The Science of Service Systems. p. 274.
1970s, Towards a System of Systems Concepts, 1971
Source: 1940s - 1950s, Introduction to Operations Research (1957), p. 7; cited in Werner Ulrich (2004, p. 210)