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Abstract
CPIDR 3 (Computerized Propositional Idea Density Rater, third major version) is a computer program that determines the pr opositional idea density of an English text automatically. It is well known that propositional idea density, in the sense of Kintsch (1974) and Turner and Greene (1977), can be approximated by the number of verbs, adjectives, adverbs, prepositions, and con junctions divided by the total number of words (Snowdon et al. 1996). In an earlier paper (Brown et al., 2007), we refined this technique and used a part-of- speech tagger, plus adjustment rules, to obtain accurate idea density measures. CPIDR 3 is the latest product of this research program.