The fastest way for an Administrator to create a one-time list of prospects who match specific criteria is to use a segmentation rule. A segmentation rule is a rule that runs once and matches prospects based on the criteria you set. You can use a segmentation rule to perform actions on the matched prospects, such as adding them to a list, assigning them to a user, or changing their field values. A segmentation rule is useful when you want to segment your prospects quickly and easily without creating a dynamic list or an automation rule