But in a discovery-driven process, the goal is to identify assumptions, test them and gain knowledge as fast and cheaply as possible.

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The UKFPO announced on Tuesday that it had discovered "a potential error in the scanning process of the situational judgement test" and promised to manually re-mark all the affected sheets within a week.

BBC: Junior doctor

Whatever the platform, Facebook is clearly eager to give those seemingly few holdouts from its service an easy way to test the waters -- and possibly save on their messaging rates in the process.

ENGADGET: Facebook Messenger allows sign-ups with just a name and phone number on Android devices