EIP schemes throughout Europe have varied in their level of prescriptiveness, from a top-down approach to the bottom-up approach favoured in Wales.
Mae cynlluniau’r EIP ledled Ewrop wedi amrywio o ran pa mor ragnodol ydynt, o ymagwedd o'r brig i lawr i'r dull o'r gwaelod i fyny a ffefrir yng Nghymru.