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(basic mistakes, interfering ideas)
These three terms are used synonymously, though each has its own resonance. The terms refer to those errors of conviction in the individual's style of living which have led to a faulty adaption and a lack of success in meeting the challenges of life. The errors (Adler), basic mistakes (Dreikurs), or interfering ideas (Powers) customarily are isolated during the process of life-style assessment (life-style diagnosis) by Adlerian therapists working with clients in psychotherapy.

Excerpted with permission from Griffith, Jane & Powers, Robert L.