Certain traits are seen as especially influential in the formation of an overall impression of an individual; these are called central traits. Other traits are less influential in impression formation, and are called peripheral traits. Which traits are central or peripheral is not fixed, but can vary based on context. For instance, saying that a person is warm versus cold may have a central impact on an individual's impression formation when paired with traits such as "industrious" and "determined", but have a more peripheral impact when paired with traits such as "shallow" or "vain".