Sprint: How to Solve Big Problems and Test New Ideas in Just Five Days: Jake Knapp, John Zeratsky, Braden Kowitz: 9781501121746: Amazon.com: Books#book#design#sprint·amazon.com·Oct 11, 2016Sprint: How to Solve Big Problems and Test New Ideas in Just Five Days: Jake Knapp, John Zeratsky, Braden Kowitz: 9781501121746: Amazon.com: Books