The book "Dependability Modelling under Uncertainty" by Philipp Limbourg offers a comprehensive analysis of the dependence of reliability models in early design phases, particularly considering uncertainties. In an era where the pressure to bring products to market faster is increasing, it is crucial to develop methods that enable quantitative analysis in these early stages. The work introduces new methods that allow for the preservation and propagation of uncertainties in relation to reliability models. It demonstrates how Dempster-Shafer theory can be used as an alternative to probability theory in predicting reliability during early design phases. These approaches are particularly valuable as they enable the integration of expert estimates and systematically measure and interpret uncertainties. The methods presented are designed to represent uncertainty in reliability models, thus providing a solid foundation for the development of more reliable products.