Texas school superintendent in a district near the Mexican Border has asked his assessment specialist, Ms. Chavez, to create a brief test that will provide the district's educators with a general idea of immigrant students' ability to read English. Ms. Chavez builds a 20 item test, administered with the use of audio taped directions in Spanish. All of the items, however, are written in English. The tests overall function is to yield a single estimate of a Spanish speaking student's ability to read English. What kind of reliability evidence would be most informative in this situation?