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It has been observed that for some conditions the transition to chaotic states and to turbulence in closed fluid flows occurs according to scenarios generally associated with low-order dynamical systems. The question arises as to whether there is a correspondence between the behavior of these low-order dynamical systems and the transition to turbulence in open fluid systems. Transition of the separated shear layer has been experimentally investigated. The degree of chaotic behavior of the separated shear layer is confirmed by applying ideas from nonlinear dynamics to the experimental data. The results demonstrate that the transition of the separated shear layer from order to chaos is through one Hopf bifurcation and the periodic bifurcation.