  In the underlying Planck scale theory we introduce a certain type of discrete
symmetry, which potentially brings the stability of the weak-scale hierarchy
under control. Under the discrete symmetry the $\mu $-problem and the tadpole
problem can be solved simultaneously without relying on some fine-tuning of
parameters. Instead, it is required that doublet Higgs and color-triplet Higgs
fields reside in different irreducible representations of the gauge symmetry
group at the Planck scale and that they have distinct charges of the discrete
symmetry group.
