Originally Posted by
Nialler
There is sometimes something to be said for legacy systems. They have probably gone through very extensive development/test/release cycles, with extensive use refining the code even further. So long as the operating system layer, along with associated substems, layered products and hardware are supported I see no problem. It happen s more than you know.
I know, to take one example, of an automated train line which runs using VMS. Not OpenVMS. VMS. Proper old school.
This is true, But that doesn't excuse avoiding regression testing. The new use might just have some operational assumptions such as parameters that the designer of the legacy system believed '
would never be exceeded' - and all the people who knew of those parameters and the operational assumptions that drove them are long retired.