Many marketing teams disregard signals from additional buying group members who appear after the initial lead. Shifting from a leads-centric approach to one that focuses on buying groups can dramatically improve marketing and sales performance. Organizations must adapt numerous internal processes and systems to make the full transition, but even small steps forward can produce significant improvements. In this report, we introduce the Forrester Buying Groups Manifesto and describe why B2B organizations must take action now to adapt their revenue engine processes for buying groups.