A weakness of Eysenck?

-The EPI was a self-report questionnaire -Subject to social desirablity bias as people want to appear better. Closed questions also meant that ppts can't expand on their answers, making people choose soemthing different to their response, doesn't best represent their response -As well as this, personalities change all the time, for example: in differnt setting like in school or with your firedn, parts of your personality might change therefore makes the data unreliable -Furthermore, modern research suggests 5 new factors: open to experience, conscientiousness, extraveriosn, agreeableness and neuroticism (OCEAN) within personality which suggest that Eysenck's view was reductionist