I am currently writing my Ph.D. thesis. The thesis is in computer science specifically the data science domain. The thesis will be based on my 8 first-authored publications in IEEE, ACM and springer. The final thesis will be eventually available online for public by the university library.
Can I use the text and figures I created and published in the conferences papers? to what extent can I copy from them? will it be considered self-plagiarism if I do so?
Looking into some of my previous colleagues' Ph.D. published thesis, I found that they have used the same exact text and figures without even citing their original IEEE papers(they mentioned in the introduction a list of papers references that are used in the thesis) while some created complete new figures to represent the results and some just included the figures while citing their papers in the captain.
PS1: I Wrote the firstname.lastname@example.org and will update the question if I get a reply.
PS2: The answer from IEEE is (That is indeed acceptable, as IEEE allows authors to use everything short of their entire paper for thesis reuse without requiring permission, provided that everything is cited. If you need to use an entire paper however, you will need to contact our permissions department (email@example.com). The following URLs may be of use to your for this and future post-publication work, and the first link specifically deals with thesis reuse.