Describes a sustainable planet index (SPI) to gauge the survivability of the earth ecologically and economically. Compares the SPI to the consumer price index and general business cycle theory from which it draws constructs. Suggests that the SPI exhibits properties of a sine wave and is useable in mathematical formulations, explanation, and…

Discusses a method of finding and implementing articles from among the sizeable amount of professional literature regarding cooperative learning. Describes the application of three teaching models (1) jigsaw, (2) group investigation, and (3) cybernetics that apply cooperative learning to elementary and secondary social studies instruction. (SG)