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In this paper we study the isotropisation of a Generalized Scalar-Tensortheory with a massive scalar field. We find it depends on a condition on theBrans-Dicke coupling function and the potential and show that asymptoticallythe metric functions always tend toward a power or exponential law of theproper time. These results generalise and unify these of De Sitter in the caseof a cosmological constant and of Cooley and Kitada in the case of anexponential potential.Comment: 10 page

Isotropization of generalized scalar-tensor theory plus a massive scalar field in the Bianchi type I model