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I read the assigned article, the best way I can explain cognitive interviewing would be to say questions are asked, to retrieve information from witnesses and victims, from memory.
The information is too include, sights, sounds, feelings and emotions, weather and other etc...
We sometimes want specifics, but in the cognitive interview, you are to repeat all things that come to memory, even if you believe it to be irrelevant.
The questions should be open for the person to use their own words, stay on point, the questions should be focused, and be detailed.
Finally the most important part of any interview and or interrogation is to build a rapport with any one giving out the information.