It is a bad plan that admits of no modification.
Pubilius Syrius
Make a plan
Work the plan
Watch the plan unfold
Test the plan
Critique the plan
Listen to what you're told
Make a plan
To change the plan
Make the changes bold
Make a plan
Work the (new) plan
Watch the plan unfold
Repeat as needed
and that's poetiquejustis
Plans fail for lack of counsel, but with many advisers they succeed.
Proverbs 15:22