Until 2019, the BSA data were collected by NatCen through face-to-face interviews and self-completion questionnaires. However, during the COVID-19 pandemic – when it was not possible to knock on doors – a different approach to reach all the participants needed to maintain the survey’s robust estimates.
In 2020, the BSA became an online survey for iran rcs data the first time. Those who were not able to complete the survey online had the chance to participate through telephone interviews. Since then, the BSA has continued with this mixed-mode design of web self-completion and computer assisted telephone interviewing (CATI).
The BSA team continuously takes all the necessary measures to ensure that the new data collection approach does not compromise the quality of the survey estimates, maintaining their commitment to high data standards. Therefore, the web survey questionnaire was meticulously designed. Also, since a push-to-web survey is expected to have lower response rates compared to the traditional face-to-face survey, the BSA team increased the gross sample size and created weights to adjust for non-response.