As cost effectiveness becomes important in producing hydrocarbons, some operators are returning to their mature field to re-fracture the reservoir in order to enhance the overall recovery. Re-fracturing has been performed on tight reservoirs on multiple wells, but little has been done to validate the results from the treatment. This paper will investigate three different approaches to validate the results from re-fracturing unconventional reservoirs and make recommendations for re-stimulation of wells in order to improved the economics in a low commodity price market.