Lennox´s puzzle

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