Writing good emails
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This makes me remember the article about how some absurd percentage of business email users were (essentially) functionally illiterate. Their emails were impossible to understand, which resulted in a huge chain of miscommunication as people replied wondering what they were talking about...and of course the people replying couldn't write either...
More and more, I think the ability to communicate effectively is the most important thing in business. It is a skill sadly lacking among many people I've worked with.