[1] The QT is partly derived from a previous psychological measurement, the Full-Range Picture Vocabulary Test (FRPV), primarily developed by Richard B. Ammons with the contributions of several other psychologists in his clinic.
At the time, the QT, just like the FRVP, was envisioned as a brief verbal-perceptual test that could measure both children and adults with intellectual or physical disabilities.
The QT was also meant to be an improvement of the FRPV, which had issues with measuring extreme responses due to the lack of limited variation in item difficulty.
The QT was tested across various genders and ethnicities and included individuals who are not part of the target population.
[3] Other researchers, such as Martha T. Mednick, also conducted several studies to test the QT's robustness.