Theory of graded consequence was introduced by the present author
in 1987. Since then several papers have appeared in journals and
edited volumes. This theory may be considered as a variant of fuzzy
logic but its difference with fuzzy logic is markable. In this talk
I would like to focus on some of the basic features of this theory.
We will present that metalogical notions like consistency,
consequence, tautologihood may be in general graded. The formalism
will be developed in an uniform way.