# Curriculum and source register

This register records why a source is used. It is not permission to reproduce
copyrighted exercises or artwork. Task families in this repository are original
and generated from independently described mathematical structures unless a
source's licence explicitly permits more.

| Source | Role | Verified |
| --- | --- | --- |
| [LehrplanPLUS Mathematik 3/4](https://www.lehrplanplus.bayern.de/fachlehrplan/grundschule/3/mathematik) | Curriculum scope, competency language, four learning areas | 2026-08-13 |
| [Verbindliche Verfahren und Endformen des schriftlichen Rechnens](https://www.lehrplanplus.bayern.de/serviceinformation/l47243) | Bavarian written procedures and expected final forms | 2026-08-13 |
| [ISB VERA-3 Kompetenzstufen Mathematik](https://www.isb.bayern.de/schulqualitaet/qualitaetssicherung/vergleichsarbeiten/vera-3/kompetenzstufenbeschreibungen/) | Flexible use of procedures, explanation and comparison of solution paths | 2026-08-13 |

Before a task family is published, its record must identify:

- curriculum area and competency;
- mathematical generator and verifier;
- representations offered;
- language review state;
- source/licence provenance;
- negative and boundary tests.