Article-based PhD and advisor's (new) role? My engineering university offers a relatively new option to do an article-based dissertation, where the primary research is submitted (and hopefully published) in several scientific journals (at my university it's 3). The dissertation is then shorter than a typical PhD, because it describes how the articles fit together to form the thesis, etc. 

It's a relatively new idea (for engineering PhDs and for me), which I find interesting as an advisor because it engages PhD students more in the research experience (publishing). Also, it is theoretically more efficient for the advisor and student (as a co-author), since time and energy spent on revising could be more focused on getting publications, and not only on a big PhD dissertation that few people will ever read. 

There are other advantages described here (not my university).

My question is not about whether it's good or bad, but how the role of an advisor on co-authored papers might change in such cases. 

For example, when students write a traditional dissertation (masters or otherwise), they often struggle with communicating. Students grow and improve written communication and contents of the dissertation in an iterative and incremental process (draft revisions after feedback from the advisor). 

In traditional grad-student co-authorship setting, I would take a more active role as an editor (as my advisor did when I was a PhD student) on a paper, mostly because of experience and to increase chances of getting an article published. Sometimes that role is minimal, if only a workshop or conference is targeted, since it might be easier to publish there.

But with an article-based PhD, it seems that the active approach in editing co-authored journal papers is essential, and in effect writing a big part of the dissertation for the student. I realize every case is different.

I'd be happy to know from experienced advisors in this setting to know if and how an advisor's role must change in article-based PhDs.
This topic is near and dear to my heart, as the number of days until I finish exactly such a thesis is measured in a single digit number.

If you field is dominated by journal, rather than book, publications, I think its a vastly superior system, leaves you better prepared for what you'll actually have to do in the future, and leaves your CV in hopefully a stronger place.


  But with an article-based PhD, it seems that the active approach in
  editing co-authored journal papers is essential, and in effect writing
  a big part of the dissertation for the student. I realize every case
  is different.


This has not been my experience - even the most active members of my committee who are co-authors on papers can't really be said to have written a significant portion of my work. Generally speaking, I would send them a fully fleshed out draft paper for their comments (which is exactly what I tend to do as first-author on a non-thesis paper), and then we'd iterate through the draft several times as they tinkered with language, added their own pet sentences, asked for additional analysis, etc. But the paper, in its final form, is very much dominated by my work and my writing.

One of the keys may be to not wait until the end of someone's graduate career to work on their writing. If someone needs you to fundamentally rewrite massive parts of their dissertation papers, in my mind they're not ready to defend. They should be at a stage of maturity where they can produce largely independent writing, in need of only the usual modifications a co-author would provide to a manuscript.