Case study research involves an in-depth study of an individual or group of indviduals.

案例研究法需要对个人或群体进行深入研究。

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In the research methods, the overall idea for the study is the case study research. Actually implementation used the questionnaire survey and interviews methods.

在研究的方法上，研究整体思路为个案研究，在实施过程中主要采用了问卷调查法和访谈法。

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Like much of the previous research on coffee, the study was based on survey data -- in this case, a single questionnaire distributed in the mid-1990s -- that may provide an incomplete picture of the participants' overall health and lifestyle.

CNN: Coffee drinking linked to longer life

In case our word isn't good enough for you, research firm Oliver Wyman has just completed a study which found that 85% of the 1, 000 global participants used their DVR to skip at least three-quarters of all commercials.

ENGADGET: Research affirms that DVR owners do indeed blaze by commercials