Traditionally, public system's institutions are regarded in general as having higher quality and accountability, but private institutions have developed quickly after the "25 de Abril" revolution of 1974, and some have today a great reputation. There are both public and private institutions considered of the highest standard and quality. However, a large majority of Portuguese students attend public schools, universities and colleges because it is considerably less expensive than the private ones, the public system has a much older implantation, and for the other side it covers well the entire territory. There are also some students who simply desire and can afford to attend an elite private institution, even if they have availability to attend one of the largest or most renowned public institutions.