Can I revise and use a part of my published paper in PhD dissertation? I have a published journal article and a book chapter (both are single-authored). I am in the process of getting permission from the publishers respectively to make the most of them for my PhD dissertation.
Well, my question is about what actions are okay as 're-use.' I asked these questions to a publisher once, but I have heard only very abstract answer (like, [...] a journal gives permission to 'reuse' and 'reproduce' to [...]).

Is it normal and okay to use only a certain part of the published article/book chapter?
(For example, exclude introduction and use only the analysis results).

Considering the overall flow of the PhD dissertation, I have theoretical discussion (Chapter 2) and analytical results (Chapter 6) far apart from each other.
In the published paper, as you can imagine, one come right after the other.
In this case, is it okay to split the published paper and put the parts in Chapter 2 and Chapter 6 separately?
If these published papers were part of your dissertation research, I don't see how there would be an issue. For example, at my University we were expected to submit and publish three papers for our dissertation. We then wrapped those papers into a single document, added an introduction chapter and conclusion chapter. My dissertation document was then published on the university website.
In my case I made sure that I did not use the publisher formatted final version of the papers. With the publishers I used, permission was not required for including in a thesis or dissertation. For example, I published some of my papers in IEEE journals. IEEE has a button on their site for each paper that you can click to get copyright permissions. It has a drop down that says &quot;thesis/dissertation&quot;. All that they require if you are the first author is to include a copyright message to IEEE in your dissertation. Of course, the practice may be different in other journals, as the licenses will vary too.
I also made the choice to only publish my dissertation in the university's open access library repository as required by the university, and not in proquest's subscription repository of dissertations as that could result in monetization of another publisher's work.
In this example I gave, self-plagiarism does not apply because 1) you would be sure to acknowledge at each chapter's beginning that this is an already-published work, 2) the dissertation is a university requirement for graduation. Nowadays, many people are publishing their chapters separately and you are required to collate them into a single document for graduation. It wouldn't make sense to me to have to write an entirely new document to report the same findings in a more wordier manner. That would be a waste of time.