1) Psychology is definitely a science. I don't know about you, KnifeMissile, but the first day of my psych class, we went over the Sci Method. All (good) experiments are carried out like any other scientific experiment, with a hypothesis, identified variables, data gathering, etc. Where have you seen that the SM hasn't been used?
I think a lot of people still don't accept it as a "hard" science yet because we still know so friggin' little about the human mind (both physically and um, superphysically).
2) It's no more or less a science than bio, chem or physics as far as merit goes. As far as advancement, it's a bit behind.
3) Strengths? It (possibly) explains why people do things and can help cure/prevent disease/disorders.
Weaknesses? Hard to do some experiments when there's the possibility of extreme permanent brain damage.
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