SO p35 Event definition
I do not understand second part of the definition of an event (Service Operation, Page 35, 4.1 Event Management).
The definition seems to include 2 parts : one which is consistent with the Event definition in the glossary (Service Operation, page 232) and the second starting with "evaluation of the impact".
There is a missing line in the right hand column if you compare it's length to that of the left colum.
My explanation to this is there is probably some text missing. Something like "(...) of IT Service. Event Management implies evaluation of the impact (...)".