There has been alot of speculation of what sciences might be involved to piece together psychohistory. It seems to me we should collectively organize these sciences and research them individually; here is what I propose: Over the next few days, people should post in this thread branches of science which they consider most relevant to the prediction and even control of societal progression. Then, I will collect these sciences into a poll and people will vote which they consider most relevant. Then, well, who knows...maybe we could organize ourselves into teams and study the various branches (this might work especially well if we plan on incorporating physics and/or psychology and/or relevant mathematics into our future education, for instance, I plan on studying chaos theory in university. After all, we need to be the pioneers of this new science if no one else takes any interest!
I'll start:

Chaos theory (pretty much everything else involving progression over time follows the principles of chaos theory in some way, including everything I've already seen mentioned in this forum)

Statistics (the building blocks for our nonlinear equations)

Calculus and beyond (the nonlinear equations themselves)

Homeokinetics and Shell Theory (seen these mentioned by others, they seem relevant to me)

Another field that should be included is game theory, mentioned my several others and considered by myself. We can use it to start actually determining where we will go. In the stories, there is a Prime Radiant, or the visual representation of the mathematics by lines. That is basically what game theory is. You use flow-chart type figures to represent the choices and outcomes of those choices. In game theory, the outcome is represented by a number. For a simple model, look up the Prisoner's Dilemma problem

i agree
the start should be basic statistical info econimic indicators

the social impact of persons or groups could be measurd in
positive or negetive by increase or decrease in food or population
example loss of farming due to war could be expressed as
% of total farming lost vrs %of population lost=more or less calories per person

Just learned recently that Nash basically came up with game theory, just struck me as interesting.

There's a lot of statistical data one could collect; I think I'm going to study previous examples of control economies and see where they went (just for some ideas, obviously psychohistory ultimately involves something far more complex).

It seems that starting from an economic standpoint is a reasonable simplification for a starting point. But taking the example of Communism, the Economic Model falls short in predicting or dictating Human Behavior.