In the Internet of Things, interconnected devices communicate with each other through standardized internet protocols to reach common goals. By doing so, they enable building complex, self-organizing applications, such as Smart Cities, or Smart Factories. Especially in large IoT environments, newly appearing devices as well as leaving or failing IoT devices are a great challenge. New devices need to be integrated into the application whereas failing devices need to be dealt with. In a Smart City, newly appearing actors, for example, smart phones or connected cars, appear and disappear all the time. Dealing with this dynamic is a great issue, especially when done automatically. Consequently, in this paper, we introduce A Life Cycle Method for Device Management in Dynamic IoT Environments. This method enables integrating newly appearing IoT devices into IoT applications and, furthermore, offers means to cope with failing devices. Our approach is evaluated through a system architecture a nd a corresponding prototypical implementation.