In 1994, Roger Sanger joined "History of the Imperium Working Group" (HIWG), an international association of fans of Megatraveller a science fiction role-playing game designed by Digest Group Publications (DGP) and published by Game Designers' Workshop (GDW) in 1987.
[1] HIWG had developed a lot of significant user-generated material for the MegaTraveller universe, some of which was included in GDW's supplement Rebellion Sourcebook.
This edition featured harder science, and moved the timeline forward several centuries, after interstellar government and society had largely collapsed.
Overnight the new edition superseded Megatraveller and made obsolete all of the material generated by HIWG over the past seven years.
It also made all of the Megatraveller material produced by Digest Group Publications out of date, driving that company towards bankruptcy.