Management tips from a brilliant business leader | Bill Gates

In the early days of Microsoft, I felt pretty confident about my coding skills, but I had a lot to learn about project management. This became abundantly clear after an incident in 1978, when I told Intel—a really important customer—that we would deliver them a version of Microsoft BASIC in four weeks. They thought I was crazy to promise it that fast, and it turned out that they were right. We were two weeks late.

Source: Management tips from a brilliant business leader | Bill Gates