One weakness Is that Freud’s explanations aren’t scientific, this is because most of his theory was based on hypothetical constructs which are subject to interpretation. E.g., id, ego, and super-ego cannot be seen but only interpreted based on actions. This is a weakness as the three personality traits cannot be measured empirically so we cannot be sure that they exist. However, hormones can be measured e.g., Dabb’s testing for testosterone in saliva of more aggressive and hostile people.