The field of science and engineering which deals with electrical insulation, its properties, and its applications, is indeed a diversified one, as is demonstrated by the table of contents of this Digest. Consequently, it is difficult to decide whether one accomplishment contributes more to our understanding of the field than another. However, the authors of the various chapters of the Digest have assisted in this decision by listing those recent developments which they consider to be among the most important. These are summarized in what follows.