I have been told several times that I have very good
communication skills and am able to communicate with
and get on well with all kinds of people.
I have been consistently successful at delivering
projects on time. I believe that a key element of this
is my attention to detail. (link the strength to actual
things you have done and the value that you have
created)
Some of the strengths that you might show include
determination, teamwork, leadership, reliability, expert
knowledge, working to deadlines, etc
Note these weaknesses could also be regarded as desirable qualities. The trick with this question is to describe a weakness so that it could also be considered a virtue.