I've noticed a number of questions about self-plagiarism, and since it tends to be a fairly distinct subject, I'm thinking it would be useful to have a self-plagiarism subcategory. Such posts would still be tagged plagiarism, but I think the additional distinction would be useful. Would others agree?
I agree. The tag description for plagiarism currently reads
Plagiarism is the practice of taking credit for someone else’s work. Also included in this tag are questions on self-plagiarism, which involves redundant publication or reuse of one's own work in an unethical manner.
I think this is pretty awkward. The second sentence admits that the plagiarism tag includes something which is not part of the definition of plagiarism.
In fact I dislike the term "self-plagiarism" as it seems to muddy the definition of plagiarism, which I would like to be perfectly clear. If plagiarism is the practice of taking credit for someone else's work then it follows that you cannot plagiarize yourself. This is not to imply that there is not a class of academic misconduct involving improper use and reuse of one's own work: of course there is. I just would prefer a different term be used for it. However, "self-plagiarism" seems to have caught on and, as it seems to give people the right idea, I can live with it.
On a site like ours, distinguishing plagiarism from self-plagiarism seems useful (even educational). Creating a separate tag would be a good idea.