 The Belbin Team Inventory was revised to include the Specialist role, since the role was not revealed in the original research because no specialized knowledge was required for the simulation exercise.Following the introduction of Belbin's approach to Team Role analysis in 1981, an independent study of the psychometric properties of the instruments was published in 1993 in the "Journal of Occupational and Organizational Psychology".Belbin took to task the authors, Furnham, Steele and Pendleton and the "Journal" provided Furnham space to reply.