Although the field of international criminology has mostly employed quantitative methods to test universal theories, there is a growing recognition of the potential value of qualitative methods in understanding crime and criminal justice in a globalizing world. The difficulties in developing this field are partly practical and financial. It is difficult visiting different countries and overcoming language barriers. But there are also conceptual challenges. Criminology generally is only just starting to understand and engage with the distinction between quantitative and qualitative research methods and to discover the wide range of qualitative methods employed in interdisciplinary fields, such as education, health, environmental, media, and management studies, and to recognize that theories are important in this field.