The Trobriand Islanders' concept of "karewaga" can be glossed not only as " authority" but also as " responsibility, jurisdiction, competence, sphere of influence", and so on. After a lexical semantic analysis of this concept based on the actual usage of the term in everyday Kilivila contexts of social interaction this paper points out that many of the ethical principles which are rooted in Western philosophy and thought and which should guide any field research - be it anthropologically, linguistically, cognitively or sociologically oriented - find their equivalent in the Trobriand Islanders' indigenous concept of "karewaga".