Best way to segment B2B buyers for a new SaaS tool?

Beyond firmographics, I've had the most luck layering in 'job-to-be-done' segmentation — basically grouping buyers by the core problem they're trying to solve rather than what they look like on paper. Combine that with buying role (champion vs. economic buyer vs. end user) and you get segments that actually predict behavior. Pragmatic Institute's framework is a solid starting point if you want something battle-tested.