The design, administration, revision, and validation of the Southeast Asian Summer Studies Institute proficiency examinations are reported. The examinations were created as parallel language proficiency tests in each of five languages: Indonesian, Khmer, Tagalog, Thai, and Vietnamese. Four tests were developed in each language: multiple-choice listening comprehension, interview, dictation, and cloze. The interview and listening tests were each designed to assess all of the levels of language ability in the American Council on the Teaching of Foreign Languages (ACTFL) proficiency guidelines. The study reported here (involving 218 students) explored the score distributions for each test on the proficiency batteries for each language, as well as differences between distributions for the pilot and revised versions. Relative reliability estimates for pilot and revised versions and the relationships of tests across languages were also compared. Based on the analyses it is concluded that the tests in each of the five examinations are reasonably well-centered and reliable, and distributions are adequate. (MSE)