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Let $A$ be a finite-dimensional algebra over an algebraically closed field.The problem of constructing indecomposable $A$-modules inductively from simpleones by means of exact sequences - called accessibility - is the starting pointof the present diploma-thesis. It has lead us to the consideration ofexceptional and indecomposable tree-representations of finite quivers.Following Ringel, we prove his result that exceptional representations aretree-representations. We give a detailed description of the various aspects ofthe Schofield-Induction which plays an important role in the proof. Moreover weintroduce a functor (strong hypotheses being given) which enables us toconstruct indecomposable modules of an algebra from indecomposablerepresentations of a certain bipartite quiver. We also give a proof of Ringel'sresult that each exceptional representation of dimension $d>1$ of a generalizedKronecker quiver has an indecomposable factor- or subrepresentation ofdimension $d-1$. The thesis is concluded by some calculations showing theaccessibility of representations of the 3-Kronecker-quiver in small dimensions.

\"Uber erreichbare und baumartige unzerlegbare Darstellungen von K\"ochern