In spite of many attempts at modeling natural transition, it has not b
een possible to predict the streamwise intensities. A procedure is dev
eloped that incorporates some results of linear stability theory into
one-equation and stress model formulations. The stresses resulting fro
m fluctuations in the transitional region have turbulent, laminar (non
turbulent), and large eddy components. Comparison with Schubauer and K
lebanoff's experiments have shown that the nonturbulent and large eddy
components have a large influence on the streamwise intensities and l
ittle influence on the skin friction. Finally, predictions of the one-
equation model were as good as those obtained by the stress model.