Look at all the options (really!) to be considered
A initial danger: falling into the trap of oversight! We have a
clear preference for one of the solutions so we barely look at the
others, leaving us incapable of justifying our decision,
which will appear like a fiat. It is also this analysis of
rejected options that helps us to make a decision because we feel more
legitimate in the choice made.
"One sentence and only one" to announce the decision
A second danger: believing that we soften the announcement of a
decision with oratory precautions. Quite to the contrary, the principle
of "one sentence and only one" is more respectful of
interlocutors who will soon be disappointed. Moreover, it is
only when the decision has been communicated that the real exchange can
begin.
React in the face of disappointment and discontent
That which sometimes prevents us from making a decision: the
fear of what comes after! How not to upset your interlocutors? How to
react if conflict breaks out? ... These fears are
legitimate, but a catastrophic outcome is not inevitable. The
first thing is to receive these reactions, to take them into account
(the worst would be to ignore or to minimize them): What is
most disappointing to my co-worker? Does he understand the
decision? If not, what information is he missing? Does he think that
impartiality is lacking, and if so why?... For generally, it is
not the decision that is a problem so much as lack of
consideration toward those upset by it!