Case Study

As illustrative example, consider the ranking of five fictitious smartphones

$($SP$1,...,$ SP$5),$ which are evaluated on the following criteria:

$(1)$ price $($to be minimized$)$;

$(2)$ customer reviews $($to be maximized$)$;

$(3)$ screen size $($to be maximized$)$;

$(4)$ storage size $($to be maximized$).$