So, what grade do we have?
Now that we have an overview of our 16 impacts, PEF Trust can calculate the Single Score by applying the weighting of each score as prescribed by the PEF method. We obtain an impact score in micro points (µpts). It's a bit like getting your math homework back with a 10, but you don't know the total possible score. Out of 10, it's very good; out of 20, it's average; and out of 100, it's bad.
To get the letter to display, we still need to compare our Single Score to that of a comparable reference product by weight. And find out what the total possible score is. The exercise is to perform the same calculation for this reference product to obtain a reference Single Score.
Then, we just need to compare the two Single Scores obtained: that of the Lagoped garment and that of the reference product.
Just a little more effort, we're almost there.
The rating for a reference product
There is a reference product for each category: t-shirt, ski jacket, pants, etc. These reference products are modeled according to the information described in the Product Environmental Footprint Category Rules (PEFCR) Apparel & Footwear 3.1.
The composition and average weight retained for the reference products are not fixed but may evolve based on the continuous update of available data.
The reference product itself will have a Single Score which, by convention, corresponds to a level of 50% (grade C) on a scale from 0% to 100%. Letters are then assigned based on the single score of the specific product relative to the reference product.
From this scale, we use a letter scale of A, B, C, D, and E, with A being the best score and E the worst.
Score A is assigned to products with a score between 0 and 20%;
Score B is assigned to products with a score between 20 and 40%;
And so on...