I took the Enneagram test today as a part of a training program. Apparently the technique was developed and used in ancient times in Middle East by the Sufi Saints.
Though I am wary of such tests, today the few people I knew in the class (and with whom I had spent considerable amount of working time) aptly fitted their personality type. And as the entire test consists of 3 seemingly disjointed tests, its difficult to tame/tweak the test.In fact, the Instructor pointed out their behavior in previous sessions and co-related with their personality type. There’s  lots of literature available on the web. Strongly recommended, if you work in a team.I am a Type 8.

How true are these tests?

Update 1 : Discussion on Aardvark.

Update 2 : Discussion on Quora.