Case study is occasionally confused with experimental single-case design--an experiment using only one group. Sometimes CSD is confused with time-series experimental design, another instance of an experiment using only one group (Nunan, 1992). “A case study or ethnographic research project may seek to answer specific questions about occurrences and their explanations similar to those answered by quantitative” oriented researchers (Tuckman, 1999, p. 401). In addition, case study design is also confused with ethnography; it is easy to see why. Babbie (2004) defines ethnography: “An ethnography is a study that focuses on detailed and accurate description rather than explanation” (p. 289). That definition could also fit a case study, and suggests that at some level a case study and an ethnographic study might overlap to the point where they would be the same. Griffee 97 such as classroom problems or language development. The third way Nunan (1992) posits a possible difference is that while both use qualitative methods, CSD can also use quantitative data collection methods. Hamel (1993) suggests that “a case is an in-depth study of the cases under consideration” (p. 1).