Discussion
The Software Maturity Index (SMI) is defined as
\(\mathrm{SMI} = [M_{f} - (F_{a} + F_{c} + F_{d})] / M_{f}\)
Where
\(M_{f}\) = the number of modules in the current release.
\(F_{a}\) = the number of modules in the current release that have been added.
\(F_{c}\) = the number of modules in the current release that have been changed.
\(F_{d}\) = the number of modules in the current release that have been deleted.
The product begins to stabilize when
Answer: A
The product begins to stabilize when SMI approaches 1. The index is the share of the modules of the current release that are unchanged from the earlier one, \(\mathrm{SMI} = [M_{f} - (F_{a} + F_{c} + F_{d})] / M_{f}\), so when few modules are added, changed or deleted the numerator is almost equal to \(M_{f}\) and the value tends to 1.
A value near 0 would mean that almost every module of the release was added or changed, which is a product still in flux, and a value near -1 would need the changes to exceed twice the number of modules, which does not describe stability. So (A) is the answer, not (B), (C) or (D).
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