I am doing two presentations at the Joint Mathematics Meetings this January in San Antonio. One is on group tests. The talk is scheduled for Monday January 12th at 10:15 - 12:15 in room 212A of the conference center. Copies of my slides and the handouts, along with another handout with more examples are below.
PDF copies of the slides
Handout from the talk_
More examples of group test questsions