The difference between a person's ascribed status and his or her achieved status is measured in terms of his or her:

Nature and development over time

Explanation:

Ascribed status is the social status a person is assigned at birth or assumed involuntarily later in life. It is a position that is neither earned nor chosen but assigned. These positions are occupied regardless of efforts or desires.

The factors that determine ascribed status are age, kinship, sex, appearance, race and social group.

While, achieved status is a social position a person takes on voluntarily that reflects both personal ability and merit. Individual's occupation falsl under the category of an achieved status; Eg , an Engineer, Doctor, Lawyer. It reflects personal skills, abilities, and efforts.