From the cover:
"A comprehensive collection of new Advantages, Disadvantages, Skills, and more. All the rules for characters since the Basic Set, Third Edition."
From the back cover:
"GURPS Compendium I has it all! We've searched over a hundred GURPS books and dozens of Roleplayer and Pyramid articles to bring you the most complete compilation of character generation rules ever. Compendium I includes updated and revised versions of every character-related rule that has been published since the Basic Set, Third Edition - all in an easy-to-use format."
- GURPS Compendium I