This study takes the combination of questionnaire and interview methods of investigation.

本研究采用问卷和访谈相结合的调查方法。

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Methods of investigation: case study (method), free association (tech), dream analysis (tech).

研究方法：个案研究方法，自由联想技术，梦的解析技术。

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In this paper, the paper has introduced methods of investigation engines under network environment in undertaking reader investigation.

着重论述了网络环境下利用调查引擎进行读者调查的方法。

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If you have to have your memory refreshed with your report more than a couple of times (or at all in a simple case), cannot articulate your methods of investigation, use an inordinate number of vocalized pauses, allow yourself to get flustered, or just generally look like a dunce, the defense attorney has successfully tacked you on a cross.

FORBES: Q: What are some cultural faux pas in police departments?