1 & 2: The idea of being 'usable-in-life' is that, although something may seem impressive in an abstract situation, i.e. usable-in-itself, the technology should be tested within the context of its everyday use.
3: According to the article, the iPod is designed to be as simple to use as possible, yet responsive in all situations. The paper cites the example of being able to increase the volume of the music whilst the user is jogging as evidence for usability-in-life. 'Excellent mappings' and 'consistency' are cited as reasons for the usability-in-itself of the iPod,
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