 In this video, we will present a case study that will allow us to apply different risk identification and analysis techniques in the design of an Earth observation satellite. First, we will give you some background information on the industrial context, then a short explanation about how the satellite works. Imagine you are working for a satellite manufacturer, and a customer asks you to design an Earth observation satellite, able to take detailed images of a chosen part of the world. This system should include a low-orbit observation satellite and a ground segment to control the satellite and to distribute the images. Your proposal as a satellite manufacturer is as follows, a payload, including the optical system such as a camera, image treatment units, and a sun protection cover for the camera lens, and a generic platform which ensures satellite servitudes, including a fuel tank, thrusters, batteries, solar arrays, a main computer, an attitude control, a transceiver, and a thermal control subsystem. The system operation can be described as follows. The ground segment, called command control and image center, sends orders to the satellite. These orders include positioning and capturing instructions. They are communicated via an S-band station. Through the same S-band station, the command control and image center also receives the health status of the satellite, for instance its temperature. Finally, through the X-band station, the command control and image center downloads the images captured by the satellite. Additionally, our customer has some requirements regarding safety and dependability that will be detailed in the following parts. These requirements call for many risk identification and analysis activities. First, a preliminary risk analysis is needed to develop different failure scenarios and evaluate their severity levels. Then, a fault tree analysis is necessary to demonstrate compliance with safety requirements. As the satellite must be tolerant to one outage, we suggest a failure mode and effects analysis on critical parts. Finally, a reliability block diagram must be performed to show compliance with reliability requirements. As you can see, this example enables us to apply these four techniques to a complex system. Now, you have the main pieces of information needed to start this case study.