“Motion Study is a means to permanent and practical waste elimination, — hence a prerequisite to efficient preparedness that shall be adequate, constructive and cumulative.”

Source: "Motion Study as an Increase of National Wealth," 1915, p. 96

Page 14.
The Common Sense of Political Economy (1910), Systematic and Constructive (Book I), "Introductory: Administration of Resources and Choice Between Alternatives. Price and the Relative Scale" (ch. 1)

Genetic Epistemology (1968) http://www.marxists.org/reference/subject/philosophy/works/fr/piaget.htm – First lecture <br class="br">Context: Knowing reality means constructing systems of transformations that correspond, more or less adequately, to reality. They are more or less isomorphic to transformations of reality. The transformational structures of which knowledge consists are not copies of the transformations in reality; they are simply possible isomorphic models among which experience can enable us to choose. Knowledge, then, is a system of transformations that become progressively adequate.

"To Practice Thrift and Oppose Embezzlement (1952)
1950's

Source: How to Survive the End of the World as We Know It, Plume, New York (2009), p. 13

Source: The Chronicles of Thomas Covenant, the Unbeliever

Property (1935)
Context: If adequate motivations could be assured, a far higher degree of efficiency could be maintained in socialized industries than in industries operated for private gain.

Variant: Learning without reflection is a waste, reflection without learning is dangerous.
Source: The Analects, Chapter II

Induction and Analogy in Mathematics (1954)
Context: The efficient use of plausible reasoning is a practical skill and it is learned... by imitation and practice.... what I can offer are only examples for imitation and opportunity for practice.