Concepts are not just subjective mental constructs, but are objective features of a system's design: increments of functionality that were consciously introduced by a designer to serve particular purposes.

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• Concepts are the building blocks of software systems, objective features of a system’s design.claim0.898
  Asserts that concepts are not just mental but concrete design elements.
• Concepts are cognitive structures that give coherent account of immediate consequences in complex systemsclaim0.852
  Jackson's core assertion about the role of concepts as explanatory structures bridging action and consequence
• A concept is a structure invented to give a coherent account of the immediate consequences of actions in a complex system.claim0.846
  Jackson's operational definition of a software concept.
• A concept is a structure that is invented to give a coherent account of the immediate consequences of actions in a complex system.concept0.837
  Operational definition of concept.
• A concept should have an articulated purpose; without it, there is no reason from the user’s point of view.claim0.817
  Motivation criterion justification.
• Concepts distinguish one system from another and also define product families.claim0.793
  Role of concepts in differentiating software.
• Concept (software design entity)concept0.790
  An increment of functionality consciously introduced by a designer to serve a purpose; the building block of a system's design.
• A structure is truly generated, and perceived as having life, only when it has unfolded from a nice, beautiful sequence of differentiations.claim0.788
  The most profound claim of the chapter: the niceness of the sequence is directly perceptible in the built form and is the ultimate source of living quality.