The benchmarks come from three evidence types, each read on its own terms. They include Google Trends observations using rolling 12 and 36-month windows, published click-through research from search industry sources including Advanced Web Ranking and Sistrix, and observed campaign ranges. Those evidence types are not interchangeable. Google Trends reports relative search interest rather than raw lead volume; click-through studies describe search-result behavior under their own sampling rules; campaign observations reflect the specific sites, markets, and measurement setups that produced them.
Evidence required: before using a benchmark in a board paper, forecast, or vendor brief, locate the original publisher or internal record, confirm the edition and observation period, and write down the metric definition. Label each figure by type: Google Trends, third-party click research, or AuthoritySpecialist analysis (2026) for our campaign observations.
Pass condition: the benchmark can be traced to a defined source category, period, population, and metric. Fail condition: a single-market observation is treated as a market-wide fact without the period, population, and metric that produced it.
Comparison principle: compare like with like. A local pack visibility observation should not be treated as an organic ranking benchmark, a relative Trends index should not be described as a count of searches, and an enquiry observation should not be converted into causation without a measurement design that supports that conclusion.
Owner and validation: the person responsible for SEO reporting should maintain the evidence note, while the commercial owner should confirm that the selected metric answers a real decision question. Validate the benchmark against first-party Search Console, analytics, call, form, and Business Profile reporting where those systems are available.