From BrWiki
Dungeons & Dragons Edition 3.5 or D&D 3.5 is the current version of the Dungeons & Dragons, a role-playing game from the Wizards of the Coast. D&D 3.5 and Dungeons & Dragons 3rd Edition are based on the D20 system of rules. This is one of many changes from the preceding Advanced Dungeons & Dragons 2nd Edition (aka AD&D 2ed or D&D 2).
In summary, some of major changes in the rules been:
- Most dice rolls are now done using twenty-sided dice (d20).
- Proficiencies are replaced by feats and skills.
- Characters can now more freely select their professional skills and change classes.
- All classes require the same increase of experience points to progress to the next class level.
Birthright and D&D 3.5
The Birthright Campaign Setting was originally set up for AD&D 2ed. In order to allow fans to continue their Birthright enjoyment, the Wizards of the Coast has given permission to the community at http://www.birthright.net to discuss Birthright in their forum and to develop the D&D3.5 BRCS and associated documents (e.g the Atlas of Cerilia). Wizards have indicated that they have no plans to actually publish any D&D3.5 version of Birthright themselves but they remain copyright holders of Birthright and D&D3.5.