Speak about what makes you angry
What is really annoying, is not so much that the work is not
done but that it might never be. The question is really about
priorities, not the lack of time.
If a colleague continues to not do what is expected it could be
that there are no real consequences if they continue like this. In the
end, even if we get cross we still allow them to
continue. For it to change, something new has to be introduced
into the equation (a question or an unusual action) to get both of us
out of the communication rut.
We've understood that the usual 'yes' is not a real 'yes'! It's
just a way of avoiding 'no'. So once the colleague has been surprised by
the change in tone we can then bring them to a
commitment. We bank on the freeze effect: once they've promised
the colleague can't go back on it.