I have been teaching and preaching that the
phrase "systems analysis" is not a proper term for the task of
building requirements. In reality it causes a lot of
misunderstandings for young professionals.
In fact, the phrase "systems analysis" was used since, in the past,
reverse engineering an "existing system" or "old system" was the
popular way to gain insight about the Universe of Discourse.
Check some of the arguments in a brief summary of a panel
at WER 04.