As shown in the figure, I divided the online quality and stability into five fuzzy intervals. Green is the corresponding output (quality), such as online quality (general) and stability (good), then the output quality is (good);

The above picture only evaluates the comprehensive effect by quality and logistics cost, but the principle is the same; If the quality output of the previous step is (good) and the logistics cost output is (general), the comprehensive effect can be judged as (good).

The above picture is for illustration only. The specific operation can be tested by the fuzzy toolbox of matlab, and the experience will be deeper.