There are three main types of descriptive methods: observational methods, case-study methods and survey methods.
描述性研究法一共分为三类：观察法，案例分析法以及调研法。
2
This paper makes a survey and investigation on the English learning situation among Non-English Majors in Non-Governmental Colleges by means of the descriptive statistics and qualitative analysis.
Methods Retrospective survey and descriptive research analysis were made with annuals reports of infections diseases during 1984 and 2003 in Baoan District.