Bayesian Net Hierarchical Alternatives Display. This is a basic hierarchical Bayesian Net example. For the hooked track (9393), the ID Cands button was depressed resulting in the hierarchical ID alternatives popups in the lower part of the display. The Bayesian Net estimates the Environment/Category as 66% Land, 33% Air and less than 1% Surface. Given Land, the only alternative is Surveillance Site (100%). Normally, the Specific Type scrolling list would show the alternatives given the selected or most likely Platform but in this example the operator had selected display of All Spec Types. This is sometimes necessary to cut across the alternatives hierarchy horizontally because branch-by-branch analysis may be too tedious. Whenever a platform or emitter candidate is selected, at any level in the hierarchy, the entire set of alternatives is redisplayed to be consistent with that selection. The operator confirms the alternatives at any level. This set of displays would be used in manual mode, high ambiguity semi-auto mode, or to review a target’s fusion decision and current alternatives. Of interest to note is the EA-6B candidate which makes the list because of its jamming pod. Its probability is low however, less than a percent.