engineering design process

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Across
  1. 2. step: clue: by selecting a promising solution
  2. 4. step: clue: redesign if its needed.
  3. 5. step: clue:think outside the box
Down
  1. 1. step clue:to identify the need an constant
  2. 2. step: clue:make a prototype
  3. 3. step clue: look up the problem
  4. 4. step : clue: evaluate the prototype