Each supranational species index is examined to determine whether it can be included in the multispecies indicators. Species with either a very large or a shallow population index and less precise trend values are examined in detail and potentially discarded (for details, see chapter 3).
PECBMS coordinators compare the indicators computed with their previous versions. The procedure is same like in case oftrends and indices. Again, when an inconsistency is found, PECBMS coordinators try to unravel whether this is caused by improvements in the data (e.g. improved national data sets, longer time series, new countries contributing their data) or computation error.