Tallgrass Beverage, a fictional maker of bottled iced tea and sparkling juice, has run 12 studies since 2016: surveys, focus groups and a diary study. Every questionnaire, data file, report and transcript sits in one private library. Ask a question in plain words. The answer cites the study, year and sample behind every claim, and says plainly when the evidence is thin or old.

Everything the library knows comes from these studies and nothing else. Each one is indexed down to the question, the table and the transcript line, so an answer can point to where it came from.

Which topics each study covered. Dark cells are a main topic of the study, light cells are partial. Click a topic to see how much evidence sits behind it and how recent it is.

The library is honest about its limits. Each topic is scored on how much evidence there is and how recent it is. When either falls short, the library says so and suggests the smallest study that would close the gap.

The library is one part of Pervasive Insights, a City Research Solutions product. It sits alongside synthetic panels calibrated to your own customers, and both rest on human research.