Problem: I need to explain the relative magnitude of one project in comparison of another.
Possible Solution: Estimated Relative Impact on Resources (ERIR)
I came up with the idea to use the estimated number of person hours, money, number of people involved, and an educated guess as to the riskiness of the project to calculate a number. I call the calculated number the "Estimated Relative Impact on Resources" because it's an estimate, it's useless without comparing it to other projects therefore, it's relative, and it's designed to show the impact on the resources of an organization. When this formula is used for multiple projects (probably applied by the same person who uses the same basis for assigning the estimates) it can provide some idea as to impact of one project on an organization's resources in relation to another project.