Since its introduction, the MEng has become the degree of choice for most undergraduate engineers, as was intended. The most common exception to this is international students who, because of the substantially higher fees they are charged, sometimes opt to take the tradition BEng/B.Sc. route where that is available. Most of the engineering institutions have now made an MEng the minimum academic standard necessary to become a Chartered Engineer. Students who graduated before the changes in the rules will still be allowed to use their bachelor's degree for this purpose and those who have earned a bachelor's degree since the changes can usually take some additional courses (known as 'further learning') over time to reach an equivalent standard to the MEng Some older universities such as Durham allow students to obtain the BEng degree after the third year before continuing on to the fourth year.