Mr. Damien Owens:

IS 465 provides a testing framework and a regime under which to take tests. Like all standards, it needs to be based on certainty and rigour. What time has shown since the standard was introduced is that there are other mechanisms of deterioration at play here. It is very difficult for a standard to be adaptive and take that into account. Mr. Garrett might have a view on this as a practitioner who has undertaken sampling.