The universe is studies of traditional rice agriculture in Southeast Asia. All the comparative studies to date have included rice in Southeast Asia. Rice is well understood as a crop, and the technologies that are used in growing it are reasonably well understood. The homogeneity of the “rice” harvested is assumed, and thus there is a single metric for the output which is reasonably comparable. There are a number of good studies of swidden rice. Swidden is still a major environmental issue in Southeast Asia (see Leach 1949; Freeman 1955; Dove 1983; Levang 1993), and is still being practiced over substantial areas (Huke 1982b). A small number of case studies have been located. The swidden cases are (1) Land Dayak, (2) Iban, (3) Lisu, and (4) Shan. The sawah cases are (5) Bang Chan, (6) Ban Ping, and (7) Shan. These are the only cases I have been able to find where all the variables are measured with reasonable confidence.