I think there are differing approaches for dealing with that, and it differs based on your target market. In the enterprise space you absolutely have to have a

I think there are differing approaches for dealing with that, and it differs based on your target market. In the enterprise space you absolutely have to have a six to twelve month roadmap of where you want to go. The trick then is to take the big features and break them down into manageable chunks that can be delivered over time. You also need to have some wiggle room so when something takes four weeks longer than expected you can adapt without just blindly pushing everything back a month.