Test authors want to validate their updated new version of an instrument. They give the old version to one group of students, and give the new version to another group of students at the same time. What kind of validity are they trying to establish?

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National Council for Therapeutic Recreation Certification (NCTRC) is the premier credentialing organization for the profession of Therapeutic Recreation - It deals with the certification of recreational therapists.
 


Test authors want to validate their updated new version of an instrument. They give the old version to one group of students, and give the new version to another group of students at the same time. What kind of validity are they trying to establish?