Yes, it's unusual - and no, it doesn't have to be complex or justified in any depth at all in order to work.
It's a way of predicting the future, that's all. It's dressed up as scientific in nature - the predictability of the behavior of human beings in humongous groups compared to the laws of physics, etc.
In one of the occasional actually dramatic scenes in the books, everyone realizes quite suddenly that it's not working when it fails to predict the appearance of the Mule. Then they spend some unnecessary time rationalizing why it failed.
To dramatize this in an appealing way for TV or the movies it's almost going to have to be from the POV of some characters who are questioning the whole edifice of psychohistory and the society founded on it - neither Seldon nor psychohistory itself are adequate protagonists or motivating forces as they stand.
It's a way of predicting the future, that's all. It's dressed up as scientific in nature - the predictability of the behavior of human beings in humongous groups compared to the laws of physics, etc.
In one of the occasional actually dramatic scenes in the books, everyone realizes quite suddenly that it's not working when it fails to predict the appearance of the Mule. Then they spend some unnecessary time rationalizing why it failed.
To dramatize this in an appealing way for TV or the movies it's almost going to have to be from the POV of some characters who are questioning the whole edifice of psychohistory and the society founded on it - neither Seldon nor psychohistory itself are adequate protagonists or motivating forces as they stand.