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The Crawley-Boevey's Theorem states that for a given tame algebra $\\Lambda$, and for each dimension $d$ almost all isomorphism classes of indecomposable $\\Lambda$-modules of dimension $d$ are isomorphic to their Auslander-Reiten translations and hence belong to homogeneous tubes. In this paper we prove the converse of Crawley-Boevey's Theorem and thus give an internal description of tameness in terms of AR-quivers. 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The well-known Drozd's theorem asserts, that $\\Lambda$ is either tame or wild. The Crawley-Boevey's Theorem states that for a given tame algebra $\\Lambda$, and for each dimension $d$ almost all isomorphism classes of indecomposable $\\Lambda$-modules of dimension $d$ are isomorphic to their Auslander-Reiten translations and hence belong to homogeneous tubes. In this paper we prove the converse of Crawley-Boevey's Theorem and thus give an internal description of tameness in terms of AR-quivers. 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