As the video streaming industry continues to mature, QoE expectations continue to rise in importance both as a value proposition to the consumer as well as a differentiator between competing video streaming services. Yet, consistent, systematic, standardized, objectively measured, and business-rules-driven QoE assurance continues to be an elusive goal. This document outlines factors that impact consumer QoE, sheds light on some of the underlying challenges to diagnosing QoE impact and provides a set of best practices for end-to-end QoE monitoring in video streaming workflows.