Obtaining informed consent ensures the users' autonomy and privacy, and that the users are aware of potential risks and benefits of your HCI study. That consent should be freely given, specific, informed and unambiguous by way of a request presented in clear and plain language. Consent should be given by an affirmative act, such as checking a box online or signing the form. Please reach out to your superviser in case of any requests.
This informed consent is not suitable for vulnerable groups (children, disabled, prisoners) or when any harm can occur (medical studies). Please consult your local ethics committee.