You can use B2B marketing agencies to supplement your resources with leading expertise; elevate your creative and content; and drive value from data, analytics, and martech investments. But to access these benefits, you first have to select from a diverse set of agencies that vary by size, capability, and B2B focus. B2B CMOs should use Forrester's Now Tech report to understand the value they can expect from a B2B marketing agency and select agency partners based on size and functionality.