Self plagiarism is a unique type of plagiarism. Self-plagiarism is when an author reuses or recycles content that has already been published. The content can be either data or written text. The table below shows the different ways how self-plagiarism can occur (content from Stephen Gilliver).
|Old data with new supporting data presented as a new study.
|Essentially the paper or article published in two different journals.
|Previously published data (with or without new data).
|Reuse of published text in a new publication.
|Different results as separate papers when best presented together.
Stephen Gilliver. Forgive me for repeating myself: Self-plagiarism in the medical literature. European Medical Writers Association 2012; 21(2): 150-3. Adapting from: Miguel Roig. Avoiding plagiarism, self-plagiarism, and other questionable writing practices: a guide to ethical writing. http://ori.hhs.gov/sites/default/files/plagiarism.pdf