This bibliography is an addendum to a 1987 update of an earlier bibliography on proficiency-related issues in language teaching and testing. The bibliography includes publications that appeared in 1987 and 1988, and a few that appeared in 1986. The 84 citations include basic bibliographic information, and are organized in the following categories: (1) oral proficiency testing (history and background); (2) proficiency in the other modalities (listening, reading, writing, and culture); and (3) implications and applications of the proficiency concept for all modalities (subcategorized under curriculum, classroom instruction and testing, accuracy, focus on the learner, teacher education and certification, less commonly taught languages, technology, and business); and (4) the debate over the proficiency approach. (MSE)