  We describe a method for estimation of the discovery potential on new physics
in planned experiments. The effective significance of signal for given
probability of observation is proposed for planned experiments instead of the
usual significances S_1 = n_s/sqrt{n_b} and S_2 = n_s/sqrt{n_s+n_b}, where n_s
and n_b are the average numbers of signal and background events. Application of
the test of equal-probability allows to estimate the exclusion limits on new
physics. We also estimate the influence of systematic uncertainty related to
nonexact knowledge of signal and background cross sections on the discovery
probability of new physics in planned experiments. An account of such
systematics is very essential in the search for supersymmetry at LHC.
