Actors Ellen Pompeo, Sandra Oh, Katherine Heigl, Justin Chambers, and T.R. Knight reprised their roles as surgical interns Meredith Grey, Cristina Yang, Izzie Stevens, Alex Karev, and George O'Malley, respectively, continuing their expansive storylines as focal points throughout the season.
From Wikipedia, the free encyclopedia. In psychology, trait theory (also called dispositional theory) is an approach to the study of human personality. Trait theorists are primarily interested in the measurement of traits, which can be defined as habitual patterns of behavior, thought, and emotion.n some theories and systems, traits are something a person either has or does not have, but in many others traits are dimensions such as extraversion vs. introversion, with each person rating somewhere along this spectrum.
1 It is controversial whether or not these traits are innate.  2 Traits in the trait theory refer to innate characteristics and it is questionable, at best, to consider them only as a partial outgrowth of personality. 3  There is no situational awareness.4  The terms may mean different things in different contexts.he trait theory states that leaders have certain innate traits that enable them to lead, such traits as assertiveness, dependability, persistence and adaptability it is convenient to list the elements that Ralph Stodgill (1974), the originator of the trait theory, determined [1] : Traits. Skils.