A Culture Special Circumstances agent who appears in both 'The State of the Art' and 'Use of Weapons.'
In State of the Art Diziet Sma is a female and is on the ship GCU Arbitrary. The mission is to assess Earth for contact by the Culture. Diziet is in favor of contact between the Culture and Earth, which she thinks will halt Earth's many conflicts, the GCU decides against this.
In Use of Weapons Diziet recruits a person calling himself "Cheradenine Zakalwe", a non-Culture citizen, to help with aiding less advanced races with military problems to advance the Cultures goals.