“The core of a root definition of a system will be a transformation process (T), the means by which defined inputs are transformed into defined outputs. The transformation will include the direct object of the main activity verbs subsequently required to describe the system.”

—  Peter Checkland

Source: Systems Thinking, Systems Practice, 1981, p. 223 as cited in: Gillian Ragsdell, Daune West, Jennifer Wilby (2002) Systems Theory and Practice in the Knowledge Age. p. 82. In the original quote Checkland summarised his earlier work with Smyth published in 1976.

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Peter Checkland 10
British management scientist 1930

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Genetic Epistemology (1968) http://www.marxists.org/reference/subject/philosophy/works/fr/piaget.htm – First lecture
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