With current patterns of product consumption and production, pressure on already limited natural resources, a growing global population, an increase in the concentration of greenhouse gases in the atmosphere and reduced access to clean water around the world, it is important to examine how manufacturing companies are incorporating sustainability issues into their product development. The concepts of lean and sustainability are increasingly used in companies as a means to reduce waste, either alone or as a complementary tool. Studies indicate that there is compatibility and synergy between them, mainly because eliminating waste benefits both companies and the environment. Despite the extensive research on the relationship between lean and sustainability, most studies do not adequately address the question of what aspects of sustainability can be impacted by lean product development tools. This dissertation presents current scientific considerations on sustainability and lean in product development. It identifies aspects of sustainability that can be influenced during product development according to the literature. It also identifies tools and practices of lean product development that can contribute to these aspects. It is worth noting that all three dimensions of sustainability are considered in this thesis, because sustainability itself is the balance of these three dimensions, and if one of them is neglected, the whole system becomes unsustainable. Additionally, a case study was conducted to gather data on aspects of sustainability that companies consider during product development under real-life conditions. The interviews provided information on which lean tools engineers use most frequently and whether they incorporate sustainability aspects. The information on the occurrence of aspects and tools, gathered through a review of the scientific literature and a case study, was used to create a survey questionnaire. Survey research with experts from academia and the industry provided data on the impact of the most common lean product development tools on the most common sustainability aspects. Based on a literature review, a case study and a survey in which experts assessed the impact of lean tools on sustainability aspects, a model of the impact of lean tools in product development on sustainability aspects was created. The model was verified through testing with simulated and real data. The model measures the impact of specific lean tools that designers already use in their work on selected aspects of sustainability. This enhances engineers' recognition of their own contribution to product sustainability via the tools they use and the choices they make when using these tools on a daily basis.