Easily add additional data for each respondent in extension to the basic respondent data. Create and define groups as you please such as gender, age, relevant disability, treatment, operation and similar in order to make grouping of participants possible or if some specific information about the participants is required.
Not only does this useful feature helps customers to group participants in various ways pending on the categories, but it also helps customers to analyze and compare answers within same respondent category.
You can define the categories as you please in order to match the project requirements i.e. if you need to differentiate the participants putting them in groups with identical categories.