How do you prove AI marketing ROI to a board?

You prove AI marketing ROI to a board by isolating one use case, baselining the metric it actually moves, and reporting the delta in the board's financial vocabulary: pipeline created, pipeline velocity, cost per opportunity, influenced revenue. Treat ROI as a system, not a story, baseline, delta, operating change. Example: an AI SDR pilot (Drift or Qualified) where cost per opportunity drops 18% against a clean 90-day human-SDR baseline beats any "productivity" claim. Vague productivity gets cut. Specific deltas get funded. Start with our AI marketing ROI framework before planning season, not after the pilot is politically dead.