It’s defined the universe that will be contacted (population or companies) in possess of information that will be collected by a questionnaire.

Once defined the universe we pass to define the method of sampling that guaranteed a sample representative of population, in other words able to supply an estimation of population’s opinions.

Sampling can be done following several modes:

List: a list of e-mail address is randomly extracted and a survey presentation e-mail is sent, with a link to the survey’s pages if necessary.

Pop-up: questionnaire is submitted to a site's visitor every “n” contacts. This survey typology is methodological similar to personal interview used by Internet site.

Quotas: we fix a number of unit interviewed characterised by a specific attribute (for example n male and m female). The phase of contact go on until the quotas fixed is covered. Typically quotas respect universe’s composition.