Interrogation.

Project Gutenberg EPUB3 edition Linebarger, Paul Myron Anthony
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The profile obtained from civilian polls or from propanal can then be paralleled in the field. Set up a graph showing the entire enemy army. Use several graphs if the army splits along racial, national or plainly sectional lines. On each graph, enter the component groups. From the poll or from the interrogations, list the dissatisfaction in terms of seriousness with which the dissatisfyee attributes to it; it is not what you think he should worry about that is important. It's what actually he does worry about. His weighting counts. Make up a scale, quantitative on the actual count of mentions of particular gripes. (For example, out of 699 prisoners, of whom 167 were union members in civil life, there were 234 separate voluntary mentions of dissatisfaction with the enemy government's labor union policy). When that quantitative count changes up or down, you have a definite guide with which to control your own propaganda policy.
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Figure 37: Defensive Counterpropaganda. The "National Socialist Leadership Staff of the Wehrmacht" got out this Communications for the Troops as a guidance sheet for company talks. The content includes "Thoughts About the Volkssturm," "The Celebrated American Freedoms," and "Small Requests, but Important." This issue is dated from January 1945.
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Or you can proceed qualitatively. List enemy dissatisfaction under terms such as these for any one issue (shoe rationing, health facilities, minority rights, esteem for government leaders, etc.): Prisoner—
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(1) is completely satisfied and has no complaints.
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(2) has a few complaints but is generally satisfied.
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(3) has many complaints and does not expect improvement.
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(4) is despondent about the whole situation.
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(5) is definitely antagonistic to home authorities in this matter.
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Rate each prisoner or captured civilian according to your best judgment. Then make up percentage lists of the grounds for dissatisfaction of each component group in the enemy society. (This latter figure will be impressive in documents but will not mean as much for practical purposes as will the more specific percentages under each separate head.)
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If you feel like showing off, average everything into everything else and call it the Gross Index of Total Enemy Morale. This won't fool anyone who knows the propaganda business, and you won't be able to do anything with or about it, but you can hang it on a month-by-month chart in the front office, where visitors can be impressed at getting in on a military secret. (Incidentally, if some smart enemy agent sees it and reports it back, enemy intelligence experts will go mad trying to figure out just how you got that figure. It's like the old joke that the average American is ten-elevenths White, 52% female, and always slightly pregnant.)

Source attribution

Psychological Warfare, Project Gutenberg eBook #48612

Opinion Analysis. Specificity.