# ODA concepts

Core definitions, measures and classifications in ODA analysis.

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This skill covers what the main ODA measures mean, how they are calculated, how donors and sectors are grouped, and which indicator fits which question about a donor's effort or priorities.

## References

- [references/key-indicators.md](references/key-indicators.md): ODA/GNI, sector shares, and the bilateral/multilateral split: what each measures, how it is calculated, and which question it fits.
- [references/core-oda.md](references/core-oda.md): Core ODA: its definition, the items it excludes, and how it compares with total ODA.
- [references/donor-groupings.md](references/donor-groupings.md): DAC members, DAC associates, non-DAC donors, and EU Institutions, and what including EU Institutions does to totals and rankings.
- [references/sector-groupings.md](references/sector-groupings.md): ONE's sector definitions by CRS purpose code and how they differ from the raw CRS structure.