> For the complete documentation index, see [llms.txt](https://help.delpha.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.delpha.io/core-concepts.md).

# CORE CONCEPTS

- [How Delpha works — resolution, evidence, confidence, credits](https://help.delpha.io/core-concepts/how-delpha-works-resolution-evidence-confidence-credits.md): The concepts behind every Delpha check: the resolution as the unit of work, evidence on every verdict, confidence and review states, and credits as the single meter across channels.
- [The six data quality dimensions](https://help.delpha.io/core-concepts/the-six-data-quality-dimensions.md): Delpha uses six dimensions — completeness, validity, uniqueness, consistency, accuracy and timeliness — to score data quality. Each metric ensures your data is clean, consistent and accurate.
- [Trusted sources & how Delpha weighs them](https://help.delpha.io/core-concepts/trusted-sources-and-how-delpha-weighs-them.md): Every Delpha resolution cross-checks trusted, verifiable sources in a strict priority order. See the source hierarchy and how each level is weighed, with Ultimate Parent as the reference example.


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