This part of IEC 61400 defines generic information categories to which fractions of time can be assigned for a wind turbine generating system (WTGS) considering internal and external conditions based on fraction of time and specifying the following: ? generic information categories of a WTGS considering availability and other performance indicators; ? information category priority in order to discriminate between concurrent categories; ? entry and exit point for each information category in order to allocate designation of time ? informative annexes including: ?C examples of optional information categories@ ?C examples of algorithms for reporting availability and performance indicators@ ?C examples of application scenarios.