The subject of Time has a wide intellectual appeal across different dis-
ciplines. This has shown in the variety of reactions received from
readers of the first edition of the present Book. Many have reacted to
issues raised in its philosophical discussions, while some have even
solved a number of the open technical questions raised in the logical
elaboration of the latter. These results will be recorded below, at a
more convenient place. In the seven years after the first publication,
there have been some noticeable newer developments in the logical study
of Time and temporal expressions. As far as Temporal Logic proper is
concerned, it seems fair to say that these amount to an increase in
coverage and sophistication, rather than further break-through
innovation. In fact, perhaps the most significant sources of new
activity have been the applied areas of Linguistics and Computer Science
(including Artificial Intelligence), where many intriguing new ideas
have appeared presenting further challenges to temporal logic. Now,
since this Book has a rather tight composition, it would have been
difficult to interpolate this new material without endangering
intelligibility.