Abstract: The invention relates to a method for determining a wind speed in a plant (1) having at least two wind turbines (2) spaced apart from one another. In order to determine the wind speed with high accuracy, it is provided according to the invention that an occurrence of a change in the local wind speed is detected for the at least two wind turbines (2), whereupon at least one time difference by which the local changes at the at least two wind turbines (2) are offset is determined, whereupon the wind speed is determined based on the time difference and a distance (3) between the wind turbines (2). In addition, the invention relates to a plant (1) having at least two wind turbines (2) spaced apart from one another.

Abstract: A method for testing the reliability of complex systems, and includes the evaluation and optimization of the availability of such systems.