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• If we have a winning tree, we keep its overall structure and try replacing its weak areas with the best ideas from the other trees:
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• If we don’t have a winner yet, we may need to create two or 3 hybrids to test in the second round, to see if we can come up with a winning structure.
  

•  example

This is often a difficult processWhen 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:

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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.

•  example

. Which is why we heartily recommend retesting your hybrid tree to make sure everything works as you intended.

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Next: Rewording and replacing tasks

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