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Reference.org
40 principles of invention
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<p>The 40 principles of invention are a suite of ideas that purport to aid in solving hard technical problems. </p><p>The principles are based on <a href="/facts/TRIZ/6Lw9YjMK">TRIZ</a>, a theory about problem solving. They are used together with <a href="/facts/Contradiction_matrix/FSP4xR6F">contradiction matrices</a>. </p>