When we first contemplated a book on this subject we were faced with a number of options: (a) to write it all ourselves, which would have had the merit of internal consistency and continuity of style; (b) to produce a collection of existing papers. which would have given us expert views in the various sub-fields of the economics of nuclear energy and would have put us in the position of knowing from the start exactly what the authors' contribu­ tions would be: (c) to commission contributions from individual specialists, chapter by chapter; or (d) some combination of these options. We settled for the last - we have written some of the material ourselves, have obtained permission to use some existing papers that seem to us to be valuable contributions to the subject, and have been fortunate in persuading a number of eminent people in their fields to produce papers especially for the book. This has given us a great deal of work and taken up more time than we planned for but we believe the result justifies this time and effort. It enabled us to design a structure for the book from the outset, recognizing that there are several aspects to the economics of nuclear energy - especially if we take a broad view of what is embraced by the word 'economics'.