Clozentropy procedure is a method whereby researchers pretest messages to determine their levels of comprehensibility among given audience members. It is often used to measure the English language proficiency of foreign students. The procedure utilizes a passage of prose from which words are deleted on either a random or systematic basis and replaced with blanks. Subjects fill in the blanks with what they feel are the words the author used, and their responses are compared with those agreed upon by a standard criterion. In one experiment the subjects were Filipinos with both low-level and high-level education and both low and high degrees of familiarity with the subject of the message. The content variables were difficulty level and idiosyncrasy level. Results indicated that the level of education accounted for more variance in comprehension than did the idiosyncrasy level. Results of the study support the premise that the clozentropy procedure is a valid and sensitive method of measuring communication comprehension. (RN)