Design and engineering knowledge are not reducible to scientific principles; operational principles are needed.

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• The operational principle of a concept should mention only that concept and its directly or indirectly depended concepts.claim0.835
  A rule relating operational principle to dependence graph.
• What Design Principles Should Guide Development Of Generalquestion0.799
• Architectural 'design,' the 20th-century process, does not work and cannot work in principle.claim0.798
• Alexander's principles are universal across substrates—architecture, digital products, design—because they address people and their needs.claim0.796
• Analysis of living forms that have never existed before is necessary to reveal deep design principles of life as it can be.claim0.793
  Central premise of the paper.
• The operational principle provides a structure for defining concepts to overcome these difficulties. It gives an archetypal scenario that explains how the concept works to fulfill its purpose.quote0.788
  Definition of operational principle.
• Software design concepts require grounding in phenomenological rather than purely formal frameworks.claim0.787
• The design problem is redefined not around building a structure to last, but promoting processesclaim0.786
  Assertion from the NRCS specification sheet that LTPBR shifts focus from structural permanence to process promotion.