This paper reports the results of a preliminary study which attempts to determine whether or not a system developer’s cognitive style will have an impact upon the quality of a system developed by the developer in question. Two groups of system development projects are compared; the projects are all the result of development teams’ efforts. One group of project teams (the control group) was assembled without regard to the cognitive style of the team members, the other teams were assembled following the application of a thinking mode identification tool (the Herrmann Brain Dominance Instrument).