* 강연시간: 10:00-11:30 I will survey the subject starting with examples and the notion of involutivity. Then we review related topics in generalized Frobenius theorems and the Cartan-Kaehler theory, Finally, we discuss open problems in the following areas: 1) Conservation laws for boundaries and for submanifolds of higher codimensions, 2) Existence of complex varieties (with singularities) in a real hypersurface of a complex space 3) Applications to control theory.