GDP data is important used to apportion funds from international organisations, to influence rating agency decisions and much more, but official data is totally inadequate for the demands made of it. The notion of GDP data is flawed conceptually, but there are also severe methodological issues that need to be addressed prior to making international comparisons and assessing data reliability. World Economics has created an interactive Data Quality Index for users of economic data which considers five readily measurable factors that influence data reliability across countries. The Data Quality Index ranks 154 countries based on an equal weighting of the five factors, but users can adjust the importance of each to their data needs.