Ellis proposed the rational emotive behaviour therapy which resolves emotional and behavioural problems by changing irrational beliefs to rational beliefs by challenging them through reality testing. He extended his ABC explanation to ABCDE. D stands for dispute, which is when the therapist and patient have a dispute about how it is an irrational belief through an empirical argument, asking if there is evidence, and a logical argument, asking if there is logic. The E stands for effect to change the irrational belief and break the link between negative events and depression.