On Managing Expectations.

John Gruber

When you say what’s coming next, people naturally want to know when. And when you tell them how long you think it will take, you’re giving them a guess, but to the customer it feels like a promise. And at heart, we’re all optimists about how long our work will take. In short, talking about work in progress and future plans is often a recipe for disappointing your customers.
— http://daringfireball.net/2013/09/vesper_whats_new_whats_next
QuotesGordon Watt