I am going to finish the 2nd year of my PhD and have been working in a field which is not the major research area of my PI. He promised there will be industrial involvement and collaboration with other professors so I agreed to work on this field, thought I have only a little bit background in the area. However all of these promises have just not been fulfilled (I did try to find collaborators myself as well). As nobody in my group is working in this field and my PI is not particularly knowledgeable about it, I feel isolated and helpless. Meanwhile, I am attracted to a field in which my PI is an expert, and several of my colleagues actively work on it.

I have mentioned this problem to my PI and he agreed I can get trained about the field which I am interested in, while continuing to work on the field I originally worked on. Recently I have found my 2-year results within my original field of study are invalid, and there are fundamental errors in it.

After learning the new field in which my group is much more active and becoming knowledgeable on it, I really feel passionate and motivated about this. It is a more difficult field but I am determined to spend time on it. As I am halfway into my PhD, how should I convince my supervisor that I should switch my research field to an area in which our group is more active and knowledgeable, while abandoning my initial field completely? I am not trying to avoid solving the problem I faced in my initial field and would not like my PI to feel that is the case. I just think working on my initial field here in my group is pointless as nobody is knowledgeable on it, nobody knows what I am doing so nobody is able to give me genuine comments, and most importantly, I am not enthusiastic about it. However I know my supervisor would like to develop this field as it is more commercially viable. I need to admit I am not genius in this field and can't just work on my own without any proper supervision.

Any opinion is welcome.

PS: I would not like to change my supervisor. This would be the last resort.

  • 1
    Do you have a time limit on your PhD? Aug 30, 2016 at 1:31
  • 5
    I'm confused. You seem to believe that your supervisor will need convincing, but you don't seem to have even discussed this with him yet. Have you tried explaining to him exactly what you just explained to us?
    – ff524
    Aug 30, 2016 at 2:19
  • 4
    This makes me so angry. When will PIs learn that while it might be cheaper to point a PhD in a direction and say 'figure it out', it's often better value for money to hire someone who has been studying that field their whole lives. It also, you know, doesn't destroy someone's life in the process. Aug 30, 2016 at 12:34
  • 5
    So I'm not sure why you think it will be a problem. Just talk to him.
    – ff524
    Aug 30, 2016 at 23:15
  • 1
    I would close this question as being too personal (as ff says: just talk to him) but I can't because it has a bounty. #seFail
    – RoboKaren
    Aug 31, 2016 at 17:50

4 Answers 4


Overall, I think your best argument is switching fields would be better for both you and your supervisor because you're likely to be more productive. But remember that your PhD is yours, and a good supervisor shouldn't have you do work you're not passionate about.

Maintaining motivation in a PhD is maybe half of the job. And doing research by yourself can be pretty demotivating—because, indeed, you can argue it's pointless. Arguably, part of the supervisor's job is to deal with that.

You need to decide whether the answer is to try harder or whether that's a waste of time. If further mistakes are likely, for instance, because you're unsupervised, so that the project is likely to fail, stopping might be a good idea.

Furthermore, you accepted your topic assuming collaborations would arise. These things are often intrinsically uncertain; but you can use this as an argument.

However I know my supervisor would like to develop this field as it is more commercial viable.

First let me answer to you.

Since you're investing years of your life for research to be published under your name, your PhD should serve your goals.

This has to be balanced with external constraints such as funding. But unless you're being paid by a project forcing you to work on your old topic, constraints are only up to your supervisor.

And especially, even if he's interested in developing a new field, that doesn't mean he has to force you to work on it.

On the other hand, a PhD is also a collaboration where both parties have interest. Talking to your supervisor, again, I'd emphasize that you're likely to be more productive on the field you want to switch to, than on the field you're working on right now.

You also have alternatives to convincing him to switch right now. Since you've already spent time on your current project, and your supervisor suggests you to work on both fields, you might want to give it a try. Try to negotiate focusing on the new field for a while and revisit the issue. At that point, if you're actually making more progress (even just in learning), you might still want to switch and have a stronger case because you're making progress. Or you might realize that after all the old field was not so bad (as they say, "the grass is always greener on the other side of the fence") and decide to work on both projects.

Relatedly, even though that's not your core question: If you have a short time limits on your PhD (3-4 years), you have a bigger problem and more motivation to get something out of your current project if possible. But if you have a more open-ended PhD (5-7 years as common in the US), changing topics after 2 years shouldn't be a big problem.


I had a similar experience in my Masters. I was frustrated with not being able to make headway without guidance. My thesis adviser admitted that much.

What worked eventually was this. I solved part of the problem and then switched focus to the bit which he was experienced in and has much interest in solving.

You are probably not the first student in your lab to face this issue. Your adviser has had students in similar situation. You could start with coming clean about the frustration, show him how your efforts have not yielded results and how you can transfer to the new problem.

There is a very similar situation described here in this link (by Philip Guo, Stanford Phd, currently an assistant professor). He admits how he was going nowhere with the problem he was working on for the first two years. You will find it very useful.

The Website: www.pgbovine.net/PhD-memoir/

His notes: www.pgbovine.net/PhD-memoir/pguo-PhD-grind.pdf

  • The story of Philip Guo is really encouraging (of course success follows from hard work!)
    – bingung
    Sep 3, 2016 at 22:55

I advise you to change your subject to the active topic of your supervisor group as soon as possible. You probably heard about "fail fast" strategy. This strategy from software engineering tells us that if you have plan A for doing something, you should have a plan B for it. If your plan A didn't work, then fail fast and go to plan B. This strategy saves us plenty of time that can be applied for other works. I have a similar story with my PI but speaking very seriously with my PI and after some hard discussion, he accepted to change my topic. If you would like to be a good researcher, it is essential to have courage and knowing your abilities.

  • Um yes, should always get a plan B. I should think of it no matter what project I work on.
    – bingung
    Sep 3, 2016 at 23:06

You really need a deep discussion with your supervisor to get things straight. What is there to convince if you haven't even talked to him(her) in the first place?

There are a few things you ought to consider before you make your decision about switching your field.

  • "I am not enthusiastic about it"; there are people who did their PhD with enthusiasm, but in many, even the people who were very enthusiastic would lose it at some point. It the the passion to complete the degree and hard work that gets them through in the end.

  • "Recently I have found my 2-year results within my original field of study are invalid" Adopting from Edison's quote, you've discovered 2-year's worth of ways that doesn't work.

  • Do everyone who do their PhD get their support from research groups and PIs? No.

  • Getting into a field where your group is more knowledgeable might allow you to gain knowledge soon but saturate just as quick. Your progress might be constrained by the progress of the group, whereas you would be more flexible in your research otherwise.

After thought about the above points, if you still hate your old field and feel passionate and motivated about the new field, then by all means go for it. Because your interest in it do matter nonetheless. You are not going to make much progress with a decision you regret; it would really be a barrier for your success.

Then again talk with your supervisor, whether you make the change or choose to stay so that you may clear the feeling of doubt in your mind.

  • I understand not all PhD students get appropriate and enough support, but I think it is natural and of interest for both the students and supervisors to provide proper supports to students
    – bingung
    Sep 3, 2016 at 23:02

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