 Moreover, documentation is valuable to the compilers, both to update the FCDB and to validate decisions made during compilation.With systems generally now being computerised, it is much easier to make documentation available.For example, the French national database provides information, where possible, on minimum and maximum values found from the different data sources used, the number of samples used to determine the selected value, a reference code corresponding to data sources for a given value, and a confidence code characterising the quality of the given value.