General provisions / S. Leible -- Formation / P. Mankowski & M. Muller -- Authority of agents / M. Lehmann -- Validity / T. Ackermann & J.-U. Franck -- Interpretation / M. Lehmann & S. Gohling -- Contents and effects / H. Unberath -- Performance / M. Schmidt-Kessel & S. Singleton -- Non-performance and remedies in general / B. Gsell -- Particular remedies for non-performance / T.W. Dornis -- Plurality of parties / M. Gebauer -- Assignment of claims / R. Feitag -- Substitution of new debtor: transfer of contract/transfer of contractual position / S. Leible -- Set-off / D. Looschelders & M. Makowsky -- Prescription / A. Piekenbrock -- Illegality / M. Lehmann -- Conditions / M. Lehmann & S. Gohling -- Capitalisation of interest / M. Lehmann.