  In this paper I revise arguments in favour of the PSL(2$|$2)
Wess-Zumino-Novikov-Witten (WZNW) model as a theory of the plateau transition
in Integer Quantum Hall effect. I show that all available numerical data
(including the correlation length exponent $\nu$) are consistent with the
predictions of such WZNW model with the level $k=8$.
