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.

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• The operational principle provides an archetypal scenario that explains how a concept fulfills its purpose.claim0.940
  Key idea for defining concepts.
• Operational Principleconcept0.849
  Technique for describing a concept through an archetypal scenario that explains how the concept fulfills its purpose
• The operational principle of a concept should mention only that concept and its directly or indirectly depended concepts.claim0.848
  A rule relating operational principle to dependence graph.
• Design and engineering knowledge are not reducible to scientific principles; operational principles are needed.claim0.788
  Polanyi's argument applied to software.
• Alexander's principles are universal across substrates—architecture, digital products, design—because they address people and their needs.claim0.750
• The essence of the process is that it generates coherent, yet quite unpredictable structure, simply by applying a few simple rules to a piece of land and its natural idiosyncracies.quote0.742
  Alexander's distillation of why the dynamic process produces living results that top-down design cannot.
• The principle of least action, though highly general, does not explain why the fifteen properties keep occurring in the world, and multiple competing explanations exist for the same phenomena.claim0.740
  Alexander's critique of least action as an insufficient and non-unique explanation for morphogenesis
• The structure which is created by a feeling for centers and by a conscious and deliberate aim towards the feeling of the whole, will often turn out to be an efficient structure.claim0.739
  Reiterated empirical observation from twenty years of practice.