To check how well iterative design techniques work in engineering projects, students can use a mix of numbers and personal opinions:

1. Prototype Performance Metrics:

   • Functionality Success Rate: Look at how many design goals the prototypes meet. Ideally, at least 80% of the goals should be achieved in successful designs.
   • Usability Testing Scores: Get feedback from users through surveys. A good target is to have at least 75% of users saying they are satisfied with the design.

2. Time Efficiency:

   • Keep track of how long each design takes. Good designs often take about 25% less time to make after a few rounds of improvements.

3. Cost Analysis:

   • Check how much money is spent on materials and resources for each prototype. If the design process is done well, costs can drop by up to 30%, especially by using materials better.

4. Feedback Integration:

   • Look at how much useful feedback is put into the new versions. Successful designs should include feedback from at least 70% of the testing sessions.

5. Iteration Count:

   • Count the number of times the design was changed before getting to the final version. A good process usually goes through 3 to 5 changes.

By using these measures, students can effectively evaluate how well their iterative design techniques are working.