2005-Oujda International Conference on Nonlinear Analysis, Oujda, Morocco. Electronic Journal of Differential Equations, Conference 14 (2006), pp. 191-205. Title: Non-autonomous inhomogeneous boundary Cauchy problems Authors: Mohammed Filali (Univ. Mohammed 1er, Oujda, Maroc) Belhadj Karim (Univ. Mohammed 1er, Oujda, Maroc) Abstract: In this paper we prove existence and uniqueness of classical solutions for the non-autonomous inhomogeneous Cauchy problem $$\displaylines{ \frac{d}{dt}u(t)=A(t)u(t)+f(t), \quad 0 \leq s\leq t\leq T, \cr L(t)u(t)=\Phi(t)u(t)+g(t) , \quad 0\leq s\leq t\leq T, \cr u(s)=x. }$$ The solution to this problem is obtained by a variation of constants formula. Published September 20, 2006. Math Subject Classifications: 34G10, 47D06. Key Words: Boundary Cauchy problem; evolution families; solution; well posedness; variation of constants formula.