Abstract: A facility for assembling a list of survey qualification questions to present to a person is described. The facility first initializes the list to be empty. The facility adds to the initialized list a survey qualification question for a survey elected by the person. Until the list reaches a predetermined size, repeats the following: for each of a group of candidate survey qualification questions, for each of the survey qualification questions on the list, the facility determines an asymmetric overlap score for the candidate survey qualification question with the survey qualification question on the list; among the determined asymmetric overlap scores, the facility determining a lowest one, and moves one or more survey qualification questions from the group of candidate survey qualification questions to the list.

Abstract: The invention provides compositions and methods useful for identifying, verifying or authenticating any type of sample, whether the sample, is biological or non-biological.