PTA is a Reserves tool when we analyze gas material balance. Of course, MBA requires at least two satisfactory test results and quality production accounting. Maybe two tests are okay for a single well, but in a pool with many wells, the more tests the better. Observation and suspended wells are excellent choices for pressure surveillance. Plant turnaround is an excellent time for pool wide pressure buildup surveys. Notwithstanding, consistent analytical methodology applied to all PTA is critical for reliability (i.e. develop in-country value hiring smart technologists and engineers). Reserves assessors authorized by the Securities Exchange Commission (SEC) will sign off MBA analyses for corporate valuations and budgets.