Traits are simply descriptive summaries of attributes of a person; merely describes their expressed behaviour; no assumptions about what causes the behaviour: ex. Ascribe the the trait of jealousy to george; george glares at other men who talk to his girlfriend and requires her to spend all her free time with him. Jealousy accurately summarizes the general trend in george"s expressed behaviour, but no assumptions are made about what causes his behaviour. The act frequency formulation of traits an illustration of the descriptive summary. Traits are categories of acts; a trend that consists of performing a large number of acts within a category relative to other persons: ex. The category of dominance might include specific acts such as: He issued orders that got the group organized . He assigned roles and got the game going . The act frequency approach to traits involves 3 key elements: act nomination. Procedure designed to identify which acts belong in which trait category: ex.