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The '''Greater Good''', or '''Tau'va''' (literally, "Good Greater"), is the founding principle of [[Tau]] society. The Tau'va system is based on a [[Caste System]] and is designed to allow for the advancement of the entire Tau society together towards a more successful, prosperous and easier existence in the future.{{Cite ThisFn|2}}

The Greater Good was first introduced to the Tau during the [[Mont'au]] (literally, "Death Age"), a civil war. It was during this time that the first [[Ethereal]]s came to the Tau and united the Tau tribes under the idea of the Greater Good, which involved perfect harmony and the combining of each Caste's strengths to counter the many weaknesses their culture had. Within a few years, Tau culture had become dominated by the Greater Good and they began the long march towards technological advancement.{{Cite ThisFn|2}}

The Greater Good now guides the Tau in their conquest of the galaxy. The principle forces the Tau into a two-minded state, one to expand their empire for the Greater Good, and to absorb other races and their cultures into their own, which could have disastrous effects. The ideal of the Greater Good seems to be appealing to some races, and stranded units of the [[Imperial Guard]] soldiers are said to have surrendered themselves and now live in the Tau empire, being named [[Gue'vesa]].{{Cite ThisFn|2}}

During war against other races, [[Tau Commander]]s often urge their enemy leaders to stop resisting the Tau Empire and promising that they will be allowed to retain their faith as long as it works in accordance with the Greater Good.{{Cite ThisFn|2}}