Given N the total number of questions,    we define the branching factor, that is, the percentage of questions for which AP is provided by the system, as follows: Figure 1 shows that the sum AP true positives and EAT correct classifications represents the overall number of questions that were classified correctly.
this accuracy can be further developed to present the dependencies as follows: the overall accuracy is dependent on the precision of the AskingPoint class of the AP classifier, the accuracy of EAt and the branching factor.