June 2011
Intermediate to advanced
344 pages
8h 35m
English
If you use A/B testing to compare the performance of small, incremental changes to your design, keep in mind that A/B testing will only bring you to a local maximum of usability. Making many incremental changes will get you to a good design but may not get you to the best design possible.
Imagine all possible designs for your product. Some of them are more usable; others less. If you could plot them on a graph, you might get something like this:

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