In Criterion D you will test the prototype you created between Criterion C and Criterion D against your design specifications.
You will create a justify a testing strategy which tests all of your design specifications.
You will use the testing strategy to evaluate your prototype and show whether or not it successfully fulfilled the design specifications.
You will show how your prototype could be improved.
Use this video for some helpful hints on Criterion D1
Use this video for some helpful hints on Criterion D2
Use this video for some helpful hints on Criterion D3