I'd written many complex CGI scripts using Perl before even buying this book, and the concepts in it are sound and well explained. My purpose for this book was to make the difficult transition from PERL-based CGI programming to C-based CGI, and this book definitely served the purpose well. My only two complaints are: 1) There aren't enough code examples per chapter (remember what I bought the book for), and 2) The material is woefully out of date. Still, I haven't seen anything better at CGI using C out there, and I've been looking for a long time.