The method, in the result of which does not occur the interviewing of the respondent, but the data is collected as a result of surveillance.

This method is applied, for example, in case of the need to find the prevalence of competitors’ products on sale, their assortment, pricing, advertising campaigns.

Another example – monitoring of the advertising, when it is fixed the possessing of a certain advertising, for example, outdoor advertising with introduction of results in the database.