@ErikJonker @resuna @david_chisnall OK, but that's not because of COBOL. You could write something durable and stable in any programming language. Financial software is written in COBOL because that was the language of the mainframe at the time. The fact that it's still largely in COBOL is because it's expensive to rewrite, the returns on a rewrite are hard to quantify, and the risks are huge.