for another , there are standards that have to be followed inthe exercise of the function of judicial review , namely ( 1 ) the existence of an appropriate case : , ( 2 ) an interest personal and substantial by the party raising the constitutional question : ( 3 ) the plea that the function be exercised at the earliest opportunity and ( 4 ) the necessity that the constiutional question be passed upon in order to decide the case ( people vs. vera 65 phil .