I have been experimenting with ROI model of consulting. I just can not figure out how to implement it. I provide a service to business owners where I propose potential savings. These savings may or may not be a fit for the owner. It could also be 12-18 months before the owner decides to use my suggested savings. My clients are all across the United States. Aside from going to each site and inspecting, I can not figure out an unobtrusive way that allows me to verify from my office. I am open to any and all suggestions.