A lot of companies lock up for a few weeks once a year for performance reviews. But there's a way to collect feedback in real time from Slack so that by the end of the year, you've already stored up all of this information.

We sent our user research team out to sit with customers for periods of time and get some insight into how Slack is working. We also get tens of thousands of points of contact via Twitter and our customer support ticketing system every month and can synthesize those results.

Slack is actually a technical term in product management that means the excess capacity the system has to absorb any failures or to take on new work. That's something that was really on our minds when we came up with it.

Stewart Butterfield Quotes