One of the most notable differences in the second edition of this book is that many of the appendices from the first edition have been moved to the accompanying CD-ROM. The CD-ROM amounts to a searchable database of tables, charts, and information on building codes. For example, there are more than 1,000 tables in the electronic appendices that can be searched by major categories, a table list, or an index of topics. The CD also directs students to the central web site where several hundred links are maintained to help students find manufacturer and government data, browse in newsgroups, and find any corrections and updates to the text and data tables. Students have come to expect this kind interaction through Internet searches.