Cash's crossword puzzle

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Across
  1. 4. problems with a design that need improvement
  2. 7. the use of scientific knowledge to solve problems
  3. 10. the variable that is changed in a fair test
  4. 11. the variable that is observed or measured in a fair test;result
  5. 12. the process for devising structures or systems to meet specific needs
  6. 14. an early model of design
  7. 15. limitation
Down
  1. 1. standards by which something is judged
  2. 2. the variables that are kept the same in a fair test
  3. 3. a person with scientific training who designs structures and systems that address specific needs
  4. 5. something that can be changed, controlled or measured
  5. 6. scientific principals for designing and building structures and systems to address specific needs
  6. 8. an investigation in which one variable is changed and all other variables are kept the same
  7. 9. a series of flexible steps that move an engineer from problem to solution
  8. 13. to suggest and discuss ideas for solving a problem