Learning Curve; Software learning percentage.

I'm hoping that someone can tell me what the statistical reference for 
Cost Estimation of *Software* is for calculation in a Learning Curve 
calculation. This is probably hidden in a handbook somewhere... which is 
unavailable to me right now, probably because of where I am. Yes, I have 
googled with nothing of note... interesting stuff, though.

I expect - and hope - that the percentage, if it does exist, is for 
proprietary software. A bonus would be if someone had created a 
percentage for FOSS software cost estimation. And yes, I know that 
software cost estimation is highly debatable (and arguable).

The main problem with the Learning Curve calculation on software is 
'Number of Units', which, with software, should be 1 given code reuse 
(Wright/Crawford). And that's the interesting part, given licensing. 
It's probably apparent where I'm going with this...

The reason I'm looking into this is a bit of personal interest - which 
is becoming a part of a paper. I appreciate any help anyone can offer. :)

-- 
Taran Rampersad

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