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Creators of simulations have a myriad of engineering tools to facilitate database creation, signature creation, rendering, visualization, and other essential elements in the simulation process. But the dominant influence on the appearance of the background, target, and path has always been intractable. Now efforts are being considered to develop Natural Environment Engineering Tools (NEETs) which will simplify and facilitate the systematic incorporation of phenomenologically-correct environmental effects in simulations. The authors, a meteorologist and a system engineer, describe the few extant tools, efforts to create others, and suggest a forum to define the needs. BACKGROUNDAn experience is a remembered response

This paper presents the results of initial testing of a computer simulation model which has been designed for use by persons not necessarily expert in all or any of the disciplines involved in signature analysis, and which can be utilized for evaluating sensor system performance and prediction of sensor acquisition ranges. The ATIMS III airborne turret infrared measurement system, ifight expenments, and the IASPM simulation model are described. Analysis of preliminary results comparing experimental data with simulated data for the 2 -5 and 8 -12 micron IR bands reveal the potential of the model for simulating a multitude of sensor-observed phenomena. Model strengths and shortcomings are discussed.