  We study the peculiar dynamics of two qubits quantum discord with a sudden
change in behavior. It is widely agreed in the literature nowadays that
environment induce sudden change behavior of quantum discord. We explore the
sudden change phenomenon under the action of local-independent environments,
considering the discord of two-qubit which is obtained by means of the weak
measurements on one of the two-qubit. It is shown that the sudden change
phenomenon does not appear under weak measurements. We find that the quantum
discord with weak measurements decays in a monotonic fashion, and show that
quantum discord might exhibit a sudden change only for the strong (projective)
measurement. We believe that environment is not the main role of the sudden
change, but the quantum correlation itself is.
