The Cotton and Insect Management (CIM) Model (Brown et al., 1982) was developed for the purpose of studying and improving insect pest management strategies. This model was used in 1979 and 1981 by a group of engineers and scientists to develop a new strategy for the control of Heliothis spp. in the Mississippi Delta. This strategy has an action threshold which varies with the phenology of the crop and is referred to as the Dynamic Threshold (DYN) strategy (Brown and McClendon, 1982).

This strategy was developed by a trial and error approach and was based on the intuition and field experience of the group involved. As new strategies were proposed by the participants, the strategies were evaluated using the CIM model. Although the DYN strategy appears to be an improvement over the Current Insect Control (CIC) strategy, better strategies probably can be developed.