Which approach did Ralph Kimball champion in data warehousing methodologies?

The bottom-up approach favoring dimensional modeling built around data marts

While Bill Inmon established the conceptual framework, Ralph Kimball introduced an influential alternative methodology. Kimball's approach favored a bottom-up strategy, focusing on building smaller, focused analytical structures called data marts first. These marts were then structured using dimensional modeling techniques, which made specific business areas highly accessible for reporting and analysis, contrasting with the more enterprise-wide, top-down integration focus often associated with Inmon's initial vision.