It is based on real word data rather than modelled data, which suggests that it has solid empirical roots. Furthermore, the approach has been applied in many countries and a whole range of the accounts have been in use and tested for a number of years already. Most countries have however focused on applying the specific parts of the SEEA that they had a specific interest in. The data which feeds into the SEEA tends to be widely accessible, for the most part - although some of the data is provided by industry in the context of non-disclosure agreements between statistical offices and the industry.