During the next year, members of th

During the next year, members of the team have collaborated to solidify the definitions of the parameters and focused on the most difficult drivers, the size parameters. While our experts agreed that the number of requirements was an indicator of the size of the Systems Engineering effort, most agreed they were a necessary but not sufficient predictor. Another parameter involved was the effort needed to pin down the interface requirements and the operational concept document. As the team dug deeper, it found that determining the weight of these other indicators was not so straight-forward a task. We found that the domain in which Systems Engineering was performed influenced the selection of these parameters (e.g., sensor systems were driven by the number of sensormodes while command and control systems were driven by the number of operational modes) as did the organization performing the task. Not surprisingly, both the number of drivers and the evolution path for the model changed as new people and organizations became affiliated with the effort.