This kit is based on a review of the organization charts of 71 member libraries of the Association of Research Libraries (ARL) gathered in January 1991, compared with an earlier SPEC Kit published in 1986, and contains charts of 29 of the libraries. A summary of the chart analyses presents information about the titles of library directors, reporting lines of library directors, the span of control of library directors, assistant/associate directors, committees on organization charts, systems and automation, preservation and conservation, public relations/public affairs, development, planning, and microcomputers. There appear to be few significant changes in library organizational structures since the 1986 survey. Almost all of the charts indicate that libraries continue to organize around traditional functions, although some of them have been renamed (which is often the result of automation of the work involved). Committees appear on the charts somewhat more frequently as a part of the formal organizational structure than they did in the previous survey, and it is noted that parallel structures, like committees, have served in other fields as transitions to more participative structures, like teams or self-managing work groups. The appearance of microcomputers in the current charts portends even more importance of this vital area of growth. (MAB)