Table 2.

Definition of criteria for selection of enrollment-performance records

Priority	Criterion
1	There is a unique pair of enrollment-academic status
2	The school and grades are the same as the previous year
3	The final situation of the students is either approved or reproved (different to retire or transfer)
4	There was a change of school within the year
5	The greatest number of the following sub-criteria are met: Of all pairs, it is the lowest numbered teaching modality code, it is the lowest numbered grade available, the grade reported in the enrollment is less than or equal to the academic status grade. Teaching modality code identifies the characteristics of a grade: primary or secondary, its target audience (children and youth, adults, or people with disabilities and/or disorders), and its orientation (vocational, scientific humanist, among others)
6	A random pair is selected