The NASA Langley Research Center is currently conducting a stall/spin research program to define fighter aerodynamics applicable during spin entries and developed spins and to develop analytical methods to use such measured aerodynamics for theoretically calculating these spin motions. Some static, forced-oscillation, and continuous rotation aerodynamic data have been measured for several current fighter models over a large poststall angle-of-attack range. This paper discusses these aerodynamic data and illustrates both the extremely nonlinear dependence of such data on several variables and the correlation that exists between the three types of measured aerodynamics. The current analytical methods for using these areodynamics to calculate spin entry and developed spin motions are discussed and correlated with experimentally obtained spins.