The growing importance of polymer chemistry in higher education has been underscored by recent articles in THIS Journal. An initial series of papers on the development of polymer chemistry (1-3) was followed by an entire issue devoted to that subject (4). In addition to several articles on "basic principles of polymer chemistry," there were papers dealing with "aids to learning and teaching polymer chemistry." A third excellent series dealt with some areas of current research in polymer characteristics and properties, e.g., molecular weight and molecular weight distribution (5), morphology (€>), rheology (7), mechanical properties (8), and rubber elasticity (9). A very important characteristic of amorphous polymers, the glass transition temperature (Tg), was discussed briefly (8). The intent of this article is to present general glass transition temperature information in hopes that it can be used in the same educational maliner as that found in the previously referenced papers. Detailed reviews on this subject can be found elsewhere (10-13).