In How Cadence Predicts Process, Mary Poppendieck writes:

If you want to learn a lot about a software development organization very quickly, there are a few simple questions you might ask. You might find out if the organization focuses on projects or products. You might look into what development process it uses. But perhaps most the revealing question is this: How far apart are the software releases?

At Automattic, we use continuous deployment, where we average about 16 product releases a day.