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Observations of quantum behavior in macroscopic systems have been reported for decades. Experiments on microwave-driven Josepshon systems have been a particularly rich source of data due to the simplicity of the Josepshon relationships and the direct physical manipulation of the devices. We review key types of experiments of anomalous resonances, Rabi-oscillations, Ramsey fringes and other related types of measurements, such as qubit entanglement. However, we take the approach of investigating the observations through nonlinear analysis of the the well-accepted, driven-damped, non-quantized Resistively and Capacitively Shunted Josephson (RCSJ) model.