Illiterate people weren&#x27;t required to read books all day to function in society, and trying to read a book and failing would not usually lead to one&#x27;s life being ruined. The same is not true for computers. Computer security is much more important than book security — and even in the case of literacy, writers of safety-critical documents take pains to ensure that readers will understand important parts rather than tossing out impenetrable and ambiguous prose and telling readers to up their literacy if that&#x27;s a problem.