Mike,
Thanks for the comments! And Male of course
Perhaps I should have summarised my earlier post. The essence of being SA is IMHO being aware of the"knowns" so the the only things affecting a decision are the sudden unexpected "unknowns" i.e. conflicting traffic (air or ground), unexpected weather, requested changes in course etc.
Good SA will reduce the unknowns in the decision set.... if you are really good the solution may just be obvious.
As Paco points out the decision making only comes at the end - SA is based on observation and a continual thought process....
(and you will be in the right lane if the gap was big enough
)