C) Individual interview all the way! You'll get more in-depth and personal feedback from the workers if you talk to them one-on-one. Plus, they might be more comfortable opening up that way.
I'm going with B) Structured interview. Sure, direct observation is great, but you can still get a lot of valuable insights by talking to the workers directly and asking targeted questions.
Direct observation seems like the obvious choice here. I mean, we're talking about assembly line workers - you can't really get a better understanding of their job by just asking them questions.
Paul
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