There have been several other scholarly studies of the validity and reliability of Belbin's approach over the nearly 26 years since the Furnham-Belbin exchange, most of which have used the inventory in its original form. Fisher, Hunter & MacRosson (2001, June) argue that Furnham's approach (also discussed in Fisher, Macrosson & Sharp (1996)) has fundamental problems in the definitions of several of the eight roles (see also Broucek & Randall (1996) for a more detailed treatment of this problem). Both the Fisher, et al. (2001) and the earlier Broucek & Randall (1996) find that observational and factor analytical approaches yield five rather than eight role constructs. Fisher, et al. go on to argue that this coherence of the five traits of teams is backed up by earlier research by Barrick & Mount (1991).