Those reforms have never been evaluated using rigorous methods of program evaluation. (educationnext.org)
The more rigorous methods used to rate tornadoes now are only a few decades old, making it hard to compare tornadoes now to those in the middle of the 20th century and earlier. (scientificamerican.com)
We strive to achieve this mission by conducting real world field tests of new policy and program ideas using the most rigorous methods possible to assess their effectiveness. (mdrc.org)