Series creator Sid Meier has stated that creating a Civilization game is based on a "rule of thirds" design philosophy: one third consists of keeping in core concepts that define the series, another third for making edits based on player feedback, and a final third for brand new content, often introduced by a new lead designer. Despite each game having a different lead designer (as per this philosophy), Sid Meier's name is still included in the title of each game.
Contributed by Kitsune Hawk