Bisnode Belgium collects data from consumers through surveys about their consumption habits which they can voluntarily fill in in order to receive personalized offers, participate in contests or take advantage of promotions. For an example, see www.permesso.be.
Bisnode also concluded partnerships with commercial companies which provide information about their customers.
Finally, data are also completed with a certain amount of statistical information, such as the ones provided by Statistics Belgium. Examples of collected informations: average income of the neighborhood where people live, percentage of gardens, of house owners, ...
All this data is collected and merged to shape our "consumers" file which is marketed.