"[3] Example paradata topics about a survey include the times of day interviews were conducted, how long the interviews took, how many times there were contacts with each interviewee or attempts to contact the interviewee, the reluctance of the interviewee, and the mode of communication (such as phone, Web, email, or in person).
Paradata information can be used to help achieve the goals of a survey.
For example, early responses may be mainly from one type of respondent, and the collectors knowing this can focus on reaching the other types so the survey has good coverage of the intended population.
Thus survey efforts can be dynamically responsive to the paradata.
[5] In principle a survey's metadata includes its paradata.