NZS 3604:2011 requires that proprietary bracing systems are evaluated using the 2010 P21 test method, which covers the evaluation and testing to assess the capacity of wall bracing systems.
Bracing systems that have been evaluated using previous versions of the P21 test may be able to have their results updated by submitting back to the testing laboratory. Old tests that have not been updated no longer meet the requirements of NZS 3604.
The 2010 P21 test tightens up some of the procedures to ensure testing laboratory results are consistent with each other.
From BRANZ Guideline, May 2014