https://www.flightglobal.com/news/articles/us-auditor-gives-backstory-of-software-reform-on-f-447143/
Quoting:
"Instead of releasing large quantities of new software-cabled capacities in multi-year blocks, the F-22 programme carved up the development work into smaller slices of capabilities that could be delivered every 12-14 weeks, the audit says.
As each new software update is coded, developers perform integrated testing to tackle bugs in more manageable chunks. Rather than waiting until the end of a multi-year block development to begin integrated testing.
The F-22 programme called the new method the Scaled Agile Framework (SAFe), according to the IG. The approach was once limited limited to the F-22 programme, but the idea began to spread last year.
In September, Vice Adm Mat Winter, the F-35’s programme executive officer, said agile-based software development would be applied to future upgrades of the F-35 and the F-22. He did not mention that the F-35 was following the lead of the F-22, which the IG report reveals had started using the incremental method four years earlier."
