This article is part of the seminar-workshop on the "Consequences of Small Farm Mechanization on Production, Employment and Incomes in the Philippines” sponsored jointly by the Ministry of Agriculture, the National Economic and Development Authority, the Philippine Institute for Development Studies and the International Rice Research Institute held on December 1-2, 1983 at Tagaytay City. It develops a working definition of a mechanized rice farm, determines the existence of mechanized and nonmechanized rice farms and looks into various factors that affect labor employment and output of small rice farms in Nueva Ecija.