Patricia A.Duff的专著《应用语言学中的案例研究》对英语作为第二语言教学领域内的案例研究史进行了较全面的梳理。和国内的案例研究相比,西方应用语言学的案例研究遵循完全不同的研究目的和研究理路。它们的案例研究拥有相对较长的发展历史,具备鲜明的方法意识,已经形成了较为科学的。 Patricia A. Duff’s book Case Studies in Applied Linguistics provides a more comprehensive review of the history of case studies in English as a second language teaching field. Compared with the domestic case studies, case studies of western applied linguistics follow completely different research purposes and research approaches. Their case studies, which have a relatively long history of development, have a clear methodological sense and have become more scientific.