Well, the goal of a job analysis is to describe exactly what is done on the job, what skills are needed in order to perform the job and possibly what personality characteristics are helpful in order to do the job well. So, a structured questionnaire is a questionnaire that asks very specific questions about each of these areas. For example, a structured questionnaire (or inventory) contains questions like, "To what extent does this job involve the following activities: a) fine motor skills, b) gross motor skills, c) eye-hand coordination, d) excellent eyesight, etc. The person who currently holds the job fills out the questionnaire and answers each question usually on a 1 to 5 scale where 1 = never and 5 = very often.
An unstructured questionnaire might take an approach like this: "Tell me about your job - what do you do?" The result is a lengthy description. This approach might reveal some things that the structured approach could miss, but usually the structured approach is preferred.
Hope this helps!
Michael
Host of The Psych Files podcast
http://www.thepsychfiles.com
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