Layers of Longevity

I imagine a complete system consisting of four layers, each concerned with a particular role and purpose:

  • Principles: A set of core values from which can inform subsequent design decisions.
  • Guidance: Artifacts of a design process that document how these principles should be enacted.
  • Tools: Models and frameworks that help practitioners implement guidance in a meaningful way and interact with any complex systems these define.
  • Products: The resulting output of the system, whose use will feed back into the make up of the layers below.