I spent a lot of time messing around with doing something similar and not succeeding[1].
I wanted to do full-on decomposed 3-point estimates. Which means representing something that is not quite a tree and not quite a table. Turned out to be harder than I was smart. I got the underlying calculation code to work fine, but never worked out how to get HTML to play along.
I did find reading about estimation to be quite enlightening though. My suspicion is that most of the improvement seen in 3-point estimates comes from decomposing the elements, not from the PERT formula.
I wanted to do full-on decomposed 3-point estimates. Which means representing something that is not quite a tree and not quite a table. Turned out to be harder than I was smart. I got the underlying calculation code to work fine, but never worked out how to get HTML to play along.
I did find reading about estimation to be quite enlightening though. My suspicion is that most of the improvement seen in 3-point estimates comes from decomposing the elements, not from the PERT formula.
[1] http://confidest.com