Abstract
This paper discusses the challenges posed by ethnomathematics as a field of study, and
suggests ways of meeting these challenges. Using an on-going ethnomathematical study on
the practice of stone walling among the Kankana-ey people of northern Philippines, it
shows how an investigation of QRS conceptual systems may be useful in identifying
unfamiliar mathematical ideas. It presents four indicators that may be used in uncovering
mathematical systems in a cultural practice, and examines stone walling using these
indicators.
Wilfredo Alangui