YouExpert is a revolutionary App designed to collect crucial data on dependencies between critical infrastructures. The study of dependencies between critical infrastructures is one of the most important research activities in the field of complex systems. To be able to fully understand the dependencies between infrastructures we decided to address ourselves directly to those who, in some way, manage the infrastructures. We therefore need your experience to understand the operational, social and economic impacts when essential resources such as water, energy, internet, public transport services etc. they become unavailable to your business. As a key figure in your industry, whether you are a restaurateur, an electricity grid operator, a bank manager or involved in any other critical activity, your contribution is invaluable. By responding to a series with targeted questions, you will help us understand the real consequences of resource interruptions on your business and your community. What you need to do is very simple: identify the category your business falls into, choose the dependencies you deem most appropriate and answer the questions you consider most relevant. The questionnaire is completely anonymous, no type of registration or insertion of personal data is required. Join us in this important research initiative. Share your knowledge and experiences via the YouExpert app and help build a more resilient future. Your participation is essential and highly appreciated.