Tyler’s model seems somewhat helpful here, and adding the components from John’s model improves it again.
+1 - you definitely want to use more signs than the ones I mentioned above to be confident that you have identified sufficient marker of expertise. The ones listed above are only intended to be necessary markers. A good way of generating markers beyond the necessary ones: think about a few people who you can confidently say are experts. What do they have in common? (Please send me any cool markers you’ve come up with! My own list has over 30 now, and it doesn’t seem like ceiling has been hit.)
+1 - you definitely want to use more signs than the ones I mentioned above to be confident that you have identified sufficient marker of expertise. The ones listed above are only intended to be necessary markers. A good way of generating markers beyond the necessary ones: think about a few people who you can confidently say are experts. What do they have in common? (Please send me any cool markers you’ve come up with! My own list has over 30 now, and it doesn’t seem like ceiling has been hit.)