Conclude for Decide: “‘I concluded to go to town.’ Having concluded a course of reasoning (implied) I decided to go to town. A decision is supposed to be made at the conclusion of a course of reasoning, but it is not the conclusion itself. Conversely, the conclusion of a syllogism is not a decision, but an inference.”
Excerpted from: Bierce, Ambrose. Write it Right: A Little Blacklist of Literary Faults. Mineola, NY: Dover, 2010.