Disclaimer: This is not a legal advice, so if in doubt ask a lawyer. We think it is not necessary to show a Cookie consent form. Here is a related excerpt from the EU commission website The EU Internet Handbook:  Consent is not required if the cookie is: used for the sole purpose of carrying out the transmission of a communication, and strictly necessary in order for the provider of an information society service explicitly required by the user to provide that service. Cookies clearly exempt from consent according to the EU advisory body on data protection- WP29 include:user‑input cookies (session-id) such as first‑party cookies to keep track of the user's input when filling online forms, shopping carts, etc., for the duration of a session or persistent cookies limited to a few hours in some cases   LimeSurvey is clearly covered by this case. In general, you can say without a cookie it would not be possible to run a normal online survey safely that spreads over several pages.