Answer to Question 1
The four basic approaches for economic evaluation of range management practices are the best case scenario, present net worth, benefit cost analysis, and internal rate of return.
Answer to Question 2
Some reasons active range management practices have often not met economic expectations based on modeling approaches is that there is high uncertainty in critical assumptions, such as forage production, livestock prices, ranching costs, and interest rates. The biggest uncertainty has centered around the occurrence and duration of drought.