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Semyon D. Savransky., Engineering of creativity, 2000 [ ]
p.162
“parameter threshold” [4]
In an efficient technique this value must be no less than some minimal level, named by Boris I. Goldovsky as “parameter threshold” [4]. Provision for lift power exceeding aircraft weight by 10 to 20% was a threshold. This condition was necessary for reliable flight of an aircraft. Another threshold was connected with the distance a steamer could travel without refueling. This threshold alone has determined the transition from a steamboat to steamship and then to an ocean liner. A necessity to overcome the parameter threshold of the currently limited technological capabilities of a society determines the mode of performance of a technique to be invented and categorizes the problems to be solved in the second case.
( Savransky, Semyon D., Engineering of creativity : introduction to TRIZ methodology of inventive problem solving / by Semyon D. Savransky., 1. engineering--methodology., 2. problem solving--methodology., 3. creative thinking., 4. technological innovations., 2000, )
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