We can understand decision-making to be the process of choosing among a set of identifiable options by considering the advantages and disadvantages of each.
Decision-making often involves argumentation because the decision is frequently the conclusion of an argument in favor of the superiority of the selected option. A very simple example of this is, "I could have soup, salad, or a sandwich for lunch. It's too hot for soup. I don't like salads. Therefore, I'll have a sandwich."
The decisions that capture our attention, of course, are usually much harder to make than that. Enjoy exploring the decision-making resources on this page!