Gui for setting probability of behaviors

Question

Hello all. I've been thinking about this for a while and haven't come to a conclusion on how best to build the gui. I have an arbitrary number of behaviors (usually 6 to 8, and probably not more than 20), the probability of all of them totals 100%. i.e.
go to store 20%
eat a meal 20%
take a nap 60%
The puzzle is how to present this in a gui so that the probability of each item can be set by people who are not everyday users. I've considered 3 options
1) The excel column header resize approach: Each item is represented as a block in a status bar, the entire bar representing 100%. (have the percentage appear in the block, with an arrow to the behavior name which resides outside of the bar) When you increase one block, the others shrink. Disadvantage is that large numbers of behaviors will probably be hard to manage.
2) Individual item status bar. Each item appears in a table row, with the second cell containing a status bar showing percentage. When you increase one, the others shrink. Disadvantage is that the user may not be able to see all of the items changing.
3) Pie chart: Each wedge displays a percentage with labels outside the chart. When you drag one piece larger, the others shrink.
Then the question is how to do the resizing behavior should work. Should the other behaviors be decreased by the same amount? It seems like it would be better to resize the non selected pieces proportionally to how big they are. i.e.
go to store 20%
eat a meal 20%
take a nap 60%
If 'go to store' increases 20%, should 'eat a meal' and 'take a nap' each decrease by 10% or should 'eat a meal' increase by 7% and 'take a nap' increase by 13%.
I've also toyed around with not doing any automatic resizing and just coloring tables with more than 100% red. For sanity's sake, I would have to include a button to normalize the table back to 100%. Don't care much for it though.
Do you hate/ like any of the above options? Is there a better way to do this? All of these options have the disadvantage of making it hard to exactly tweek the non selected numbers.
Many thanks: any thoughts would be most appreciated.

Answer 1

The issue is not how you present the UI but how you manage the multiple changes and ensuring the quality of data (ie that it totals 100).
I would consider:
a) radio buttons to change the modes - eg share evenly amongst all, share proportionally amongst all, don't share (requires separately ensuring total is 100), share to last behaviour in list (works for bar style but not for pie)
b) a 'lock' switch for each behaviour so that changes are evenly or proportionally distributed amongst any unlocked behaviors, possibly allowing the locked behaviours to still be modified directly
I think I'd go down the b) route but depending on your users a) might be viable.