You have to be careful not to plagiarise your own work. You can refer to your previous methodology and results and just present the new findings :)

You can report from what you have done earlier but you need to reference that paper of yours to avoid self plagiarism

This is what we call self plagiarism.

No, it is not OK, taking into account the mentioned percentages 28% and 20%. Apart from the insightful responses of the colleagues, rephrasing could be a solution in order to avoid plagiarism from a previous research paper.

Regards

Indeed its best to rephrase the question carefully considering the use of the word plagiarism. Plagiarism in academia is never acceptable, however using previous published work will be if it is referenced appropriately.

That percent your are talking about is not accepted in journals, try to reduce it by rephrasing the sentences.

Not justified. It is not advisible also. Try to write what your earlier work was in new form.

Rephrasing the sentences would help in similarity not being detected. But are we talking about hoodwinking or ethics? In my opinion, the editor of the journal should be informed why it is necessary to reproduce (in rephrased form) such a high percentage of previously published material. Of course references should be given to the published material. In older days when there were no electronic connections and many libraries in the developing world could not afford buying international journals,, sometime scientists from these countries would publish papers in local journals and at a later date would reproduce them in modified form in international journals for reaching out to a larger "audience". I wonder if that should be called self-plagiarism?

I wonder does someone really has time to even rewrite something over and over? romance with your own old work? or thats all what you got?

Thanks everyone for your answers the reason why I have to use my previous work is because I wanted to publish a new paper from my thesis work and as the testing process is the same for the two work the similarity was high between the two papers

Dear Munazzam,

It is neither that simple nor self-serving cover of personal deficiency. Many productive people published top-class papers in local journals that outsiders never got to read. But that apart, I know of very best petrogists repeating themselves heavily in a couple of papers published in journals in developed countries. If I remember correctly, one at least was a review paper that drew much of the information from his previous paper.

QJ

My personal experience is that the papers of a same researcher (world famous geologist) have the several paragraphs with same to same wording but differences lie in the usage of name of formation/group/unit.

No this is not acceptable and may cause the rejection of your paper, even if you are using your own work.. when you submit they will check the percentage of plagiarism present and reject the paper regardless of the source

in fact I face this problem mostly in methodology as in many times you use similar methodology in several papers, but unfortunately, we are required to rephrase each time

You need to paraphrase and also acknowledge your own work. Using synonymous terms for key concepts is also another technique.

i asked if it is continuity of the previous one, it seem to be part of it...... so it will be considered as plagiarizing,,,,,,,,,, i think if you use the same data it is better to change the variables and objectives of the study.....

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