Mainly define research object and scope, and make the synoptic introduction of domestic study condition, meaning of research, and study methods as well.

主要对本文研究对象和范围进行界定，并对国内研究状况、选题意义、研究方法作简要介绍。

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Last year, a study by the Welsh Institute of Social and Economic Research, Data and Methods (WISERD) also suggested undergraduates completing the Welsh Bacc fare less well at university than those who have not.

BBC: Welsh Bacc may be worse for university performance - study

The study, conducted by research firm InsightsNow, combines qualitative, quantitative and ethnographic methods, and tracked user behavior and clickstreams in the US, across mobile web, apps, and other mobile services.

FORBES: What Does Lady Gaga Know About Listening?

Unlike earlier research, which often used video clips or other methods to simulate crimes and witnesses, the Illinois study was the first and only one to compare the two methods in the field using actual cases.

ECONOMIST: A controversy over how to handle eyewitnesses