The ROI methodology model has been used for decades to measure the return on investment for a given project. It is a tool that businesses can use to calculate the value of a project. The ROI methodology model is widely used in business and marketing to measure the return on investment for a given project. It is one of the most popular tools that businesses can use to calculate the value of their projects. The ROI methodology model provides an easy way for companies to determine how much they should invest into their projects and how much they will gain in return.