CHESL Centre

Comprehensive Test of Phonological Processing

The Comprehensive Test of Phonological Processing (CTOPP) consists of several subtests. For the identification of language impairment on this website, only the scores from the Nonword Repetition subtest are used.

During the Nonword Repetition task, a recording of several made up words is played from the computer and children are asked to repeat the words as accurately as possible after hearing them once. The test begins with basic one-syllable nonce words and continues with increasing complexity.

Administering the CTOPP takes approximately 5-10 minutes. An additional 15-30 minutes is required for listening to responses and calculating scores.


Responses to this probe are difficult to write down or score while administering the test. It is recommended to video- or audio-tape the responses to listen to them later for the most accurate scoring.


Wagner, R., Torgesen, J., and Rashotte, C. (1999). Comprehensive Test of Phonological Processing. Pearson.