Need help with class diagram

Attachment 93991
Attachment 93993

I have an assignment to design and implement a 3-tier system for a weighted score method to compare products.
I tried to make a class diagram but I only got 2 classes "Criterion" and "Product". and not sure where to put the calculate method.



note: "cValues" will save the values that will be multiplied by the weight to calculate the score.
how to save this array in the database?

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