This is how Kleck did it.....
Armed Resistance to Crime The Prevalence and Nature of Self-Defense with a Gun
Each interview began with a few general "throat-clearing" questions about problems facing the R's community and crime. The interviewers then asked the following question: "Within the past
five years, have you yourself or another member of your household
used a gun, even if it was not fired, for self-protection or for the protection of property at home, work, or elsewhere? Please do
not include military service, police work, or work as a security guard." Rs who answered "yes" were then asked: "Was this to protect against an animal or a person?" Rs who reported a DGU against a person were asked: "How many incidents involving defensive uses of guns against persons happened to members of your household in the past five years?" and
"Did this incident [any of these incidents] happen in the past twelve months?" At this point, Rs were asked "Was it you who used a gun defensively, or did someone else in your household do this?"
All Rs reporting a DGU were asked a long, detailed series of questions establishing exactly what happened in the DGU incident. Rs who reported having experienced more than one DGU in the previous five years were asked about their most recent experience.
When the original R was the one who had used a gun defensively, as was usually the case, interviewers obtained his or her firsthand account of the event. When the original R indicated that some other member of the household was the one who had the, experience, interviewers made every effort to speak directly to the involved person, either speaking to that person immediately or obtaining times and dates to call back. Up to three call-backs were made to contact the DGU-involved person. We anticipated that it would sometimes prove impossible to make contact with these persons, so interviewers were instructed to always obtain a proxy account of the DGU from the original R, on the assumption that a proxy account would be better than none at all. It was rarely necessary to rely on these proxy accounts--only six sample cases of DGUs were reported through proxies, out of a total of 222 sample cases.