Electronic Journal of Differential Equations, Vol. 2007(2007), No. 167, pp. 1-13. Title: New approach to streaming semigroups with dissipative boundary conditions Author: Mohamed Boulanouar (Univ. of Poitiers, France) Abstract: This paper concerns the generation of a $C_0$-semigroup by a streaming operator with general dissipative boundary conditions. Here, we give a third approach based on the construction of the generated semigroup without using the Hille-Yosida's Theorem. The first approach, based on the Hille-Yosida's Theorem, was given by Dautray [8], Protopopescu [9] and Voigt [10]. The second approach, based on the characteristic method, was given by Beals [1] and Protopopescu [9]. Submitted September 6, 2007. Published December 03, 2007. Math Subject Classifications: 47D06. Key Words: Streaming operator; general boundary conditions; semigroup