 A thorough exploration of other systems is not warranted here, but care must be taken not to assume too much in the equivalences of qualifications that play different roles, in different systems, in the context of different traditions.As the incidence of a 9 or 10 in havo examinations is considerably lower than that of the top marks in the American or British grading system, it would be a mistake to equate a 10 to an A, a 9 to a B, and so forth.If the 8, 9 and 10 are taken together, as in the list shown above, they represent the top S to 15% of examination results.