Well, I put together a comprehensive array of Chardonnays spanning multiple source regions and respresentive types....and everyone has to taste them blind.
Even better, they have to taste them blind, and then talk about them and offer judgements and analyses...blind.
They do so with the knowledge that some are products they represent, and some are products that are competitive (either directly or indirectly). And that some are there specifically because they represent ideas or concepts or styles or source regions that we already discussed previously.
They come pre-armed with prior discussion, as well as having been given presentations on terroir and style, and are at the time given a sheet listing the basic styles of chardonnay, the primary global sourcing regions, basic descriptors, and so on.
It's a combination tasting/exploration/discussion meant to operate at a blinding pace, forcing people to come to decisions based on what they know (or think they know), and they do it by primarily comparing one chardonnay against another against another without overlay of label.
Some people get incredibly sharp, incredibly fast. Others look poleaxed because they can't tell the gross differences, not to mention the minor variations. And most are somewhere in the middle. But everyone comes away with a learning experience that sticks with them.
Then we do the "unveiling"----and there's almost always a chorus of gasps somewhere in there. For instance, when I include K-J in the mix, very few people ever identify it as K-J----because, most of those people admit, they have formed an image of K-J that hasn't applied in long time, but even though they've tasted K-J since then, the perceived image they've created has prevented them from appreciating (i.e., clearly seeing) the wine they've tasted.