Only a more detailed analysis of the results to determine that point. The percentage of success does not take into account the difficulty of the items. Two students with the same hit ratio may have knowledge very different level. A student has failed to respond properly to 5 items easier or considered the first level and another at 5 most difficult items where he has responded to all three levels. Both have the same score and, worse still, the same degree of certainty as to their score. The response rate indicates neither what is the importance of the items not answered correctly, or how many subjects that have not responded.
a All the reasons given and other more technical led to the adoption in each of the materials, take into account for measuring student performance, and the percentage of correct answers its location in the levels of performance. a To evaluate the results we need to know what "know" and what "they do" students. Obviously, the higher the score of a subject in a subject, most tasks can be satisfactorily resolved. To give an idea what kind of skills associated with various levels have established cut points, in this case, these points will be any structure of the tests for the measurements: a q a I level to reach a student at this level must meet 60% of questions pertaining to that level. a q a II level, so that a student is at this level I must have reached the 50% level and answer the questions for the II level.