The Diagnostic Rhyme Test (DRT) is a measurement of subjective speech intelligibility
that dates back to the 1950s. The DRT procedure
is concerned with theintelligibility of
consonants, whereby rhyming words such as "dense and tense" are tested. TheEnglish-language test includes 96 pairs of words that rhyme and differ in initial consonant.
In the DRT test, the listener hears only one word and marks the word he thinks he heard on the test sheet, on which two rhyming words are written in each case. The results are summed and evaluated. An improved version of the Diagnostic Rhyme Test is the Modified Rhyme Test (MRT).