An individual circumstance or consideration to weigh when making a decision is called a?

The term that best describes an individual circumstance or consideration to weigh when making a decision is a "factor." In decision-making processes, factors are specific elements that can influence the outcome. These can include various variables, conditions, or aspects that need to be analyzed and considered for informed decision-making.

In contrast, a criterion generally refers to a standard or principle by which something is judged or decided. While it can relate to decision-making, it serves more as a benchmark rather than an individual consideration. A parameter indicates a boundary or limit within which decisions must be made, but it does not embody a specific circumstance. An aspect denotes a particular feature or part of a situation but lacks the implication of weighing decisions versus straightforward characteristics.

Therefore, "factor" precisely captures the notion of circumstances or considerations that play an active role in the decision-making process.