Abstract
The Bohr-Mottelson Model (BMM) and the Interacting-Boson Approximation (IBA) of Arima and Iachello are compared with each other on the phenomene logical and the microscopic level and on the level of selected data. The aim is here not to demonstrate the great successes of both models. But on the phenomenological level we discuss how far the models are identical and where they are different. For the microscopic foundation we mainly investigate how well the S-D subspace represents strongly deformed nuclei. Finally we look into data to search for indications of the boson cut-off and of triaxiality. The first is a property of IBA, the latter can not be described by it.
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