Improper use of data must be avoided, as the consequences of improper use of data can be catastrophic. In the design of information systems, ethical focus areas could help combat improper use of data. Currently, more research is available on ethical focus areas in Data Mining compared to related research fields of Data Mining, such as Decision Mining and Process Mining. For this paper, a theoretical review was conducted to identify ethical focus areas of Data Mining and their possible solutions. Seven ethical focus areas were identified focussing on privacy, collection of personal information, consent, unpredictability and inaccuracy, group profiling and biased data. Future research is needed on the ethical focus areas, to validate the possible solutions related to these ethical focus areas in the context of related research fields of Data Mining.