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In our experience of testing several trees against each other, it’s rare that one tree gets it all right, while the other trees get it all wrong. More often, we get one of the following situations:
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When the New Zealand Ministry for the Environment redesigned their website, that's exactly what they did. They tested the existing tree, then developed 2 new ideas for their site structure. While both of these ideas tested better than the original site, their final tree was actually a hybrid of the two ideas:
Note that this is not always possible, because some ideas are just not compatible with others. If tree A won the first round, but there are parts of tree B that did really better than their counterparts in tree A, it may not just be an easy copy-and-paste from B to A, because what worked in B may not work with the different approach that tree A takes. Which is why we heartily recommend retesting the hybrid tree to make sure everything works as intended.
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Next: Rewording and replacing tasks