Coble et.al (2007) and OECD (2008) conclude that the assessment of risk faced by producers requires an historical series of farm-level data since the aggregated data can be misleading and can severely underestimate the farm-level production risk. Although some methodologies have been developed to estimate the farm-level yield variability from aggregated data and farm-level statistics of risk (Coble and Dismukes 2008), this document is based on statistical records of individual farms1 in Germany, the Netherlands, UK, Italy, Estonia, Australia and New Zealand over a period of 5 to 12 years. In order to maintain comparability across countries, data on crop farms producing mainly wheat were selected in most of the contributing countries.