[SystemSafety] Collected stopgap measures

[Derek M Jones]

Steve,

> Of course I wish I could have built several of exactly the same system in parallel. Unfortunately I have only been able to do that once. You realize it is too expensive to do that in the general case.

If governments are really interested in learning about software
production, they need to fund such experiments.

> When we implement that same new Type X system using an engineering approach we, as I said, finish in about half the time, with about half the cost, and with no more than one tenth of the delivered defects when compared with the mainstream estimate.

I'm assuming that you were paid to do the second implementation because
the first was such a mess.

So your data points are based on a sample that is so bad somebody is
willing to pay for another implementation.

Then, second time around you have the benefit of what has been learned
from the first project.

How can the second implementation not be faster and cheaper?

Almost any approach you use would be faster and cheaper, given
you are comparing against such a poorly performing project who
did not have the benefit of prior implementation experience.

-- 
Derek M. Jones           Software analysis
tel: +44 (0)1252 520667  blog:shape-of-code.coding-guidelines.com