Marcia developed the
Identity Status Interview, a method of
semi-structured interview for
psychological identity research, that investigates an individual's extent of exploration and commitment across different life areas. Evaluating the material provided in this interview by using a scoring manual developed by Marcia and colleagues yields four possible outcomes. The four identity statuses he distinguished were: foreclosure, identity diffusion, moratorium, and identity achievement. As Marcia himself put it, "the individual about to become a Methodist, Republican farmer like his Methodist, Republican farmer father, with little or no thought in the matter, certainly cannot be said to have "achieved" an identity, in spite of his commitment". Adolescents may foreclose on the handed-down identity willingly or under pressure. The case of "negative-identity" occurs when adolescents adopt an identity in direct opposition to a prescribed identity. Marcia saw the evidence for the endorsement of authoritarian values by foreclosures as fully commensurate with a view of them as becoming the
alter egos of their parents. Marcia stressed that once an identity crisis has been experienced, returning to the foreclosure status was no longer a possibility.
Identity diffusion Adolescents who struggle with identity development may avoid exploration and commitments, leading to identity diffusion. This least mature identity status indicates a lack of exploration and commitments in crucial life areas. This state, often accompanied by existential dread and confusion (identity crisis), can result in social isolation. Marcia suggested that those with identity diffusion "do not experience much anxiety because there is little in which they are invested. As they begin to care more...they move to the moratorium status, or they become so disturbed that they are diagnosed
schizophrenic"; or may end up adopting a negative and self-destructive identity-role.
Moratorium Identity moratorium is the status of individuals who are in the midst of a crisis, whose commitments are either absent or are only vaguely defined, but who are actively exploring alternatives. Marcia notes that "moratoriums...report experiencing more anxiety than do students in any other status...The world for them is not, currently, a highly predictable place; they are vitally engaged in a struggle to make it so". Similarly,
Jeffrey Arnett's Emerging Adulthood has, as a major facet of it, identity exploration, which shares many attributes with identity moratorium.
Identity achievement Once a crisis has been experienced and worked through, Marcia considered, "a likely progression would be from diffusion through moratorium to identity achievement". The latter is thus the status of individuals who have typically experienced a crisis, undergone identity explorations, and made commitments. Marcia found some evidence to support his "theoretical description of Students who have achieved an identity as having developed an internal, as opposed to external, locus of self-definition". ==Identity status shifts==