These are the building blocks of HSI. Each term has a specific, consistent meaning across the platform.
Source
A public origin of information that HSI monitors — a website, feed, channel, document, or organization. Sources are added and reviewed by people; nothing is collected without a human-added source.
Signal
A captured observation from a source: a claim, post, or change worth tracking. Signals are reviewed before they inform any published conclusion.
Evidence
Material that supports or contradicts a claim, linked back to its original passage and timestamp so it can be verified.
Narrative
A cluster of related signals, evidence, and sources that form a recognizable storyline. Narratives are built from real relationships in the evidence graph, not inferred by a model.
Forecast
A recorded prediction with a resolution date. Forecasts are tracked against outcomes so accuracy and calibration can be measured over time.
Investigation
A workspace that organizes related sources and evidence around a question or event.
Review
Human evaluation of a signal, evidence item, or finding before it is approved or published. Review is required; the platform does not publish on its own.
Publication
A reviewed finding made available with its citations attached.
Retraction
A withdrawal of a publication. Retractions are recorded openly rather than removed quietly.
Transparency
The practice of showing how a conclusion was reached: its sources, evidence, review, and any corrections.
Trust
A recorded, explainable measure of a source’s reliability. Trust is not a hidden score and is not a claim that something is true.