The usability lifecycle by Jakob Nielsen:

“Doing things right will only add a few percent to the cost of a development project. You will save many times this cost by not having to make expensive adjustments and dot releases. Plus, the resulting user interface will probably be around 50% to 100% easier to use, reducing training budgets dramatically and increasing user productivity. If you happen to be running an e-commerce site, you will have the sweetest
gains of all: customers will finally start making purchases now that they can find what they want on the site. Rule #1 of e-commerce: if you can’t find it, you can’t buy it.”

[words and images via mersault*thinking]

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