The common quality framework of the ESS is based on the European Statistics Code of Practice, a set of 16 principles covering the institutional environment, statistical processes and statistical outputs.
The principles are complemented with a set of 84 indicators of best practices and standards to provide guidance and reference for reviewing the implementation of the Code. For example, Principle 1 on professional independence sets down, that European statistics should be produced in an impartial and independent manner, free from any political and other external influence.
If you are interested, please click here to read more about the 16 principles and 84 indicators of the Code.