it was about; it concerned; it was a matter of
Es handelte sich, denke ich, um ein Missverständnis.
I think it was a misunderstanding.
Denkt ihr, es handelte sich um einen Unfall?
Do you think it was an accident?
Es handelte sich nur um eine Formalität.
It was just a formality.
Denken Sie, es handelte sich um einen Unfall?
Do you think it was an accident?