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While Norman's book comes in a strong second

Heidegger's explanation of readiness-to-hand in Being and Time has done more for my usability and process inefficiency evaluating skills

John Stuart Mill's "Utilitarianism" was my first assigned reading in a political philosophy class, and remains my favorite.

pick up the hardcover version and Dreyfus' Being-in-the-World and read them together

Nietzsche's On the Genealogy of Morals prompted me to question whether the values I had always held were really all that valuable.