What Is Google Ranking Factors 2017 Moz and Why It Matters for Agencies

In 2017, Moz released their biennial Search Engine Ranking Factors study, which surveyed hundreds of SEO professionals and correlated ranking factors with Google search performance data. The study ranked approximately 90 different signals that influence where websites appear in Google's search results, categorized into domains like on-page content, domain authority, link profile quality, user behavior signals, and brand metrics. Rather than claiming these were Google's official algorithm, Moz presented them as the industry consensus of what factors correlate with higher rankings. This distinction matters because Moz wasn't claiming insider knowledge of Google's algorithm—they were synthesizing expert opinion and empirical correlation data to identify patterns that consistently appear in high-ranking websites.

For agencies, this research became valuable because it provided a structured framework to explain SEO strategy to clients. Rather than saying "we'll optimize your site," you could reference Moz's data and say "we're focusing on domain authority, link quality, and on-page relevance because these are the top-correlated ranking factors." This gives clients confidence that your approach is grounded in industry research, not guesswork. The study legitimized SEO as a practice built on measurable factors, which helped agencies justify their fees and timelines. It also gave you concrete talking points during client discovery calls—you could discuss which ranking factors applied most to their specific industry or competitive landscape rather than prescribing one-size-fits-all solutions.

Practically, agencies used the 2017 ranking factors study to prioritize their work. If you're working with a new client, the Moz framework helped you identify quick wins versus long-term bets. Factors like on-page title optimization and heading structure appeared high in the ranking factors list and could be implemented quickly. Meanwhile, building domain authority through link acquisition was lower in the list but still important—so you'd communicate that it required sustained effort. The study also highlighted that user engagement signals (bounce rate, time on site, click-through rates) correlated with rankings, which pushed agencies to improve page speed, readability, and user experience alongside traditional SEO tactics.

By 2024, this particular study is dated—Google's algorithm has evolved significantly—but the 2017 research remains useful for teaching clients why certain SEO practices matter. It's also historically interesting because it represented the pre-BERT, pre-algorithm-update era when agencies relied more heavily on correlative data. Using the Moz study today works best when combined with current knowledge about how Google now prioritizes helpful content, expertise signals, and experience metrics. Reference it as part of your foundation ("here's what's been proven to correlate with rankings historically") rather than your entire strategy.