This part of ISO 12122 gives methods for the determination of characteristic values for a defined population of glued laminated timber products, calculated from test values.It presents methods for the determination ofa) characteristic value of mean-based properties, andb) characteristic value of 5th percentile-based properties.NOTE Annex B gives information on the methods that have been successfully used to estimate the characteristic values of glued laminated timber products from properties of the laminates.