This annotated bibliography is introduced by a description of the work of the Open University's Institute of Educational Technology (IET), which is concerned with all aspects of the academic work of the Open University and, increasingly, in wider spheres through its consultancy work and program of workshops on open and distance learning. The 1990 edition and its 1991 supplement cover the years 1984-1991, and contain items submitted by members of IET in the areas of educational technology, artificial intelligence, information technology, instructional materials, interactive video, computer assisted instruction, and distance education in general. Each of the four sections in this edition and the supplement begins with an explanation of how the entries are arranged, and lists authors alphabetically. The sections are: (1) Published work (83 entries for the 1990 edition and 50 for the 1991 supplement); (2) Internal papers and reports (87 entries for 1990 edition and 57 for the supplement); (3) Lectures delivered outside the university (14 entries for the 1990 edition and 22 for the supplement); and (4) Reports to external bodies (12 entries for the 1990 edition and 8 for the supplement). Indexes by number, subject matter, and authors conclude both the 1990 and supplemental lists, and an announcement of the Institute's PDET Workshop Programme for 1991 is included in the supplement. (DB)