From the title page: "This booklet is an introduction to the concepts of role-playing with specific reference to Traveller. it is included in Deluxe Traveller, or it may be purchased separately." From the back cover: "Introduction to Traveller is a guide to the world of Traveller, written especially with the beginner in mind. Book 0 details the ins and outs of playing and refereeing Traveller with tips on how to make the most of science fiction role-playing."