A real power tool amplifies the power of its user with little additional effort or instruction. Anyone capable of using screwdriver or drill can use a power screwdriver or power drill. –Unix haters handbook

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• The Psychology of everyday actions

  • seven stage:
    • Goal(form the goal)
    • Plan(the action)
    • Specify(an action sequence)
    • Perform(the action sequence)
    • Percive(the state of the world)
    • Interpret (the perception)
    • Compare(the outcome with the goal)

• knowledge in the head and knowledge in the world

• knowing what to do: constraints, discoverbility, and feedback

• human error vs bad design

• element in design

• elegent conceptual model

  • affordances
  • signifiers
  • constraints
  • mappings
    • knowledeg in the world and knowledge in the head
    • natural mapping
  • feedback

application/lib design

• elegent conceptual model
  • affordances :: unit(module, class, function) function;
  • signifiers :: unit(module, class, function) interface;
  • constraints :: type
  • mappings :: (orthogonal function)
  • feedback :: test repl, compile&run

language design

• elegent conceptual model
  • affordances ::
  • signifiers ::
  • constraints :: type, control-structure
  • mappings ::
  • feedback :: repl, compile&run

life design

• elegent conceptual model
  • affordances ::
  • signifiers ::
  • constraints ::
  • mappings ::
  • feedback ::