When Lumosity redesigned and relaunched its brain-training game application instead of updating it, the company risked angry reviews and losing the 15 million fans it had already gathered, Christina Farr writes. But it was the right move, as engagement skyrocketed. "We wanted to make fundamental changes, not just incremental improvements. We talked to existing users about what we had done and the way we did it. ... Relaunching the app really turbocharged both awareness and downloads," CEO Kunal Sarkar says.
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