This document discusses how lean tools and processes can help CMOs tackle modern challenges around increasing ROI accountability and sales funnel complexity. It recommends a 3 step approach: 1) Calculating the revenue opportunity from search to quantify the digital marketing opportunity, 2) Using multi-touch attribution to measure cross-channel effectiveness, and 3) Applying lean processes like kaizen workshops and accelerated launches to optimize campaigns and get better results faster. Case studies show how these lean approaches helped clients increase leads by 8x ROI and generate 38,000 leads for a manufacturing company.