A test developer compares a student's performance on a newly developed math achievement test to the same student's performance on a well established math achievement test for the purpose of exploring the validity of the new test.

concurrent

Explanation:

Test Validity and Reliability  is known as the degree in which a test or other measuring device are truly measuring what is intended to measure.  The test question “1 + 1 = ___2__” is a valid basic addition question that truly measures a student’s ability to perform basic addition.  In many cases it becomes less valid as a measurement of advanced addition because as it put emphasis on some required knowledge for addition, it does not represent all of knowledge required for an advanced understanding of addition.  On a test designed to measure knowledge of American History, this question becomes completely invalid.  The ability to add two single digits has nothing do with history.

corrupt also means cruel

to plan an idea out before