Partners will create "Screening rules for collecting data on biomass fuels and biomass ashes". Consequently a first data collection on biomass fuels and ashes will be made through partners own institutions and from qualified information centres. In this document guidelines are given on what kind of biomass fuel and ash related data is expected to be collected for eventual feeding into new database. The purpose or screening rules is to harmonise and streamline data to enable combination of data and calculation of useful parameters. After the definition of screening rules, the data will be carefully screened and put into the "new" database named BIODAT with also an efficient Internet interface (www.biodat.eu). Industry and others are encouraged to add their data to the new database (for further information about existing and new database please contact Jan Pels).