Ellen Lupton, in an essay on teaching writing to graphic-design students:
[M]any young designers are wondering if their own college English courses were tough enough to prepare them for real-world writing tasks such as bidding for jobs, justifying design solutions, delivering presentations and marketing their work. Even routine email communication requires command of the written language. (Some of my students seem to believe that just because they can't spell, their employers won't be able to, either.)(via Design Observer)
Writing 101: Visual or Verbal? (AIGA Journal of Design)