For anonymous answers, we neither collect any personal information, nor link an answer with a user account. We only track how many people have completed a survey, in order to avoid sending notifications to those who have already completed the survey.
Non-anonymous or public answers are assigned to an account (registered members or a recipient uploaded to a particular survey). This allows us to display the names of the people who completed the survey.
For Engaged Index surveys, only the Reward Gateway Engineering team can access the information about which user gave the answers. This is not shared with clients to protect user confidentiality. The only details that are available for clients are high-level categories. For example, location, department, or any other profile fields are visible, but only if there are more than 5 answers in a filter category, in order to protect anonymity.