Where manufacturer-specific qualification test data have been approved by a Registered Design Professional, or RDP (in New Zealand, this would be the professional engineer who is responsible for the design and who would sign the Producer Statement, or PS1), these data are permitted to be used to develop the property modification factors. In the absence of such approved qualification test data the maximum (1.8) and minimum (0.6) limits of Equations 6.1 and 6.2 are required to apply. Figure 6–8 and Figure 6–9 show the default lambda values provided in the Commentary to ASCE 7-16 Chapter 17, for ‘unknown’ and ‘quality’ manufacturers.