Another article I enjoyed discussing some very relevant points in relation to Agile marketing - some of which are followed but others that have been overlooked.
Demonstrate results: To be credible in the C-Suite, marketing needs to show its investment strategy is working, fix what is not working, and redirect investment to those portfolios that are performing the best (or have the potential to do so in the long-term). Tracking progress, measuring impact and communicating success is imperative to ensuring decision-makers see the return and continue to fully fund the marketing organization to lead the way.
http://mopartners.com/10-fundamentals-master-agile-marketing/