The Bug Nobody is Allowed to Understand
by Richard Stallman
In the 1980s, proprietary software users discovered the problem of
the bug that nobody is allowed to understand. When a problem
occurs in the interaction of multiple proprietary software packages
with different developers, none of them is allowed to study the source
code of all the pertinent programs. As a result, none of them can
understand the bad interaction between them, and the bug is never
fixed except by accident.
this article, a similar problem now occurs between
multiple instances of Software as a Service.