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  • Date: 03/01/1976
    Resource Category: Peer-reviewed article
    Describes an instrument developed to quantitatively evaluate the participation levels of students on outdoor education activities. From photographs taken at two minute intervals, students are assigned values for their observed behaviors. The correlations of values assigned by several judges are shown. ... »
  • Date: 05/24/1974
    Resource Category: Peer-reviewed article
    Biological sampling procedures that remove organisms or litter from the system being studied potentially bias the results. Bias can be estimated by considering the experimenter as a consumer in the system, and comparing experimenter consumption to other organisms feeding at the same trophic level. H. T. Odum's classic work is examined in light of ... »