Shelley Kohan, of in-store analytics company RetailNext, says it's important for retailers to consider three approaches to measurement and to match the right approach with the question that they're trying to answer. In our latest installment of BloomReach University, Video Campus, Kohan defines "quick action," "test and measure" and "long-term" testing windows and provides some examples of when each makes sense. Mike Cassidy is BloomReach's storyteller. Contact him at mike.cassidy@bloomreach.com; follow him on Twitter at @mikecassidy.