The behaviourist perspective was the most scientific out of them all and the psychodynamic approach was the least, I believe this because the behaviourist approach outcomes were based on the experiments that were conducted and the psychodynamic approach was about the unconscious mind and dreams, none of it could be scientifically proven as we cannot prove what is happening in the mind which means it is not credible.
The experiments that were undertaken in these theories, perspectives and approaches some were more ethical than others I believe the humanistic approach use the most ethical experiments as they were used in the right way and for good reason, I think the biological perspective was the unethical as they did experiments on people
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The humanistic approach says rights we are all unique, we are born to achieve our maximum potential and we all have free will meaning we all suit differently to rules and laws whereas the psychodynamic approach states we are all different and we are affected by our unconscious mind and that’s who we truly are, which would make us all