Can I use a previous paper I've written? Your thesis can build upon work you have done elsewhere. However, the BA thesis should be an original paper. You cannot double count a paper you have written for another course (this also means that you cannot just extend a paper written for another course). Whatever is being used from previous work should be disclosed and cited as such in the thesis. Please note that failure to do so will be considered a violation of academic integrity (i.e., plagiarism). It should be clear that the BA thesis develops new insights that are distinct from those developed in previous work. Keep in mind that the BA thesis should be structured around the analysis of primary research. Given that most of the papers you have written are based on secondary data, it is likely that papers you have written for other courses would be primarily useful for background, and for helping to develop your research question. If you are considering building on work done for another class, please consult your preceptor.