Английская Википедия:Heart (mobile design)
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Heart is a framework developed by Google to help the products and development teams to make decisions that serve business and user-centered. Heart[1] is a framework for mobile design and metrics. It is an acronym that stands for happiness, engagement, adoption, retention and task success. Included by Gartner as a design approach that accommodates mobile interface issues such as partial user attention and interruption.[2]
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