Before embarking on an ROI effort, you need to keep some basic ground rules in mind.

First, ROI is best used to compare potential projects with other internal decisions and success factors - NOT with those of other companies! An organization moving from stone tablets to electronic document management will achieve a higher ROI than an organization changing from one document management vendor to another. This doesn't mean you did a better or worse job; it just shows the magnitude of the change.

Second, develop a standard methodology and make that part of every technology review and investment. The more ROI calculations you do, the better you become.