Most American colleges and universities use the grading system of A, B, C, D and F. An A is worth four points, a B three points, a C two points and a D one point. Getting a grade like a B-plus or a C-minus adds or subtracts a few tenths of a point. An F is a failing grade worth zero toward a student's grade point average. A small number of colleges reject the traditional grading system. They are organized into programs taught by teams of professors. Each program brings together different subjects and extends in length over 2 or 3 quarters. Students are required to do a major research project at the end of each program. The professors write detailed evaluations of the students. These are combined with evaluations written by the students themselves. Most teachers would probably agree that traditional grades are sometimes unfair. But professors at big schools say there is not enough time to write evaluations for each student in large classes.