It is a great pleasure for me to be able to offer this paper in honor of Professor Paul Jen-kuei Li, one of the most productive linguists working on the Austronesian languages of Taiwan. I have known Paul since his student days at the University of Hawai`i many decades ago, and have treasured his friendship and respected the quality of his scholarship ever since. This paper describes some of the derivational processes by which human nouns are pluralized in some of the Northern Luzon, or Cordilleran, languages of the Philippines. Although primarily descriptive, it offers intriguing insights into the ways reduplicative processes have changed as a result of the application of regular sound changes in some of the daughter languages of the family
