The February 2003 ASWG meeting decided to let nations use their own national design theories to determine PCN. An inquiry of the U.S. Corps amongst several nations learned that the pavement design method used by individual nations lead to different pavement thickness (and PCNs). Consequently, different nations get different results. This, and the fact that the PCN reporting system does not reflect the actual pavement life are considered as shortfalls of the ACN-PCN system. Therefore additional information such as the number of aircraft passes used to make the calculation must be provided (runway only). Nations shall provide the following information:
- Airfield name, runway(s) and PCN value(s);
- Type of aircraft for which the PCN values are based;
- Number of aircraft passes used to make the calculation.
The additional information allows NATO to compare NATO airfield strength values as required and shown in the previous table.