Oliver Ebenhoeh talks about biological systems and their many layers of organization, each of which contributes to the overall complexity of a system. He presents his research interest in metabolic modelling that aims for the complete reconstitution of a particular metabolic pathway in the computer, thus being able to simulate the pathway. Oliver Ebenhoeh also voices his opinion about two critical problems in modern-day biology: the reliability and reproducability of experimental data. Oliver Ebenhoeh is an associate professor in systems biology at the Institute for Complex Systems and Mathematical Biology, University of Aberdeen, UK. The aim of Oliver Ebenhoeh’s research is the combination of physics and biology to understand the design principles of cellular interaction networks by means of theoretical approaches.