S03 Ep02 - Running Assessments at Scale - What Does it Take?

Large scale assessment implies the ability to manage massive numbers of participants all being assessed at the same time. This further implies the ability to process, analyze and report on that data, as well as the organizational infrastructure to repeat the cycle over and over.
1) What does it take to run assessments at scale—thousands of them at the same go?
2) The learnings - from planning to execution, from communication to monitoring - what needs to be managed? And what could be potential showstoppers?