Personality tests, Ego strength, Adaptability (Psychology)
One component of an MMPI Ego Strength Scale (Es) definition, personal adaptability, was investigated by behavioral, conscious, and fantasy measures of persistence. Male and female, high and low Es subjects, did not differ on these measures. Measures of persistence alone may be inadequate samples of the personal adaptability component of Es.
Dana, Richard H. and Teter, Jean T., "Extended Report of Construct Validation of the Barron Ego Strength Scale" (1964). Regional Research Institute. 11.