Cross-disciplinary:
Crossdisciplinary refers to knowledge that explains aspects of one discipline in terms of another. Common examples of crossdisciplinary approaches are studies of the physics of music or the politics of literature.
http://en.wikipedia.org/wiki/DisciplinaryInter-disciplinary:
Interdisciplinarity involves the combining of two or more academic fields into one single discipline. An interdisciplinary field crosses traditional boundaries between academic disciplines or schools of thought, as new needs and professions have emerged.
http://en.wikipedia.org/wiki/InterdisciplinarityTrans-disciplinary:
Transdisciplinarity connotes a research strategy that crosses many disciplinary boundaries to create a holistic approach. It applies to research efforts focused on problems that cross the boundaries of two or more disciplines, such as research on effective information systems for biomedical research (see bioinformatics), and can refer to concepts or methods that were originally developed by one discipline, but are now used by several others, such as ethnography, a field research method originally developed in anthropology but now widely used by other disciplines.
http://en.wikipedia.org/wiki/TransdisciplinarityQualitative research:
Qualitative research is a method of inquiry employed in many different academic disciplines, traditionally in the social sciences, but also in market research and further contexts.
http://en.wikipedia.org/wiki/Qualitative_researchEthnographic research:
Ethnographic research is a qualitative method aimed to learn and understand cultural phenomena which reflect the knowledge and system of meanings guiding the life of a cultural group.
http://en.wikipedia.org/wiki/Ethnography2011/10/21