From the back cover:
Survival Margin contains:
1 - Selected Traveller News Service articles recording the long slide into chaos, from the 1116 assassination of Strephon to the 1130 release of the final weapon. Annotated with the private, personal observations of Emperor Strephon, Archduke Dulinor, and Archduke Norris.
2- History of the "virus," the artificially intelligent computer life form that changed the face of the Imperium.
3- Overview of the emergence of the mysterious Star Vikings.
4- Procedures for updating Traveller and MegaTraveller into the Traveller the New Era system.
This book is almost solely background material, except for 16 pages that are intended to help with the transfer of characters from Traveller/Megatraveller to TNE.