A fault-tolerance management of a software component is disclosed. A number of instances of the software component are executed in at least somewhat different execution environments. A local error susceptibility register and a global error susceptibility register are assigned to each software component. An error of first instance of the software component is detected. The local error susceptibility register of the first instance is updated based on the detected error and the content of the local error susceptibility register of the first instance. The global error susceptibility register of each instance is also updated based on the detected error and the content of the global error susceptibility register of each instance. The difference between the respective local error susceptibility register and the respective global error susceptibility register is determined, and the fault tolerance value of the software component in the respective execution environment is determined based on the determined difference.