1. Euclid. I. Overview of the Euclid mission: the high-level overview of the Euclid mission: the main science objectives, expected performance, survey characteristics, data-processing steps, and data products.

2. Euclid. II. The VIS Instrument: the specification, design, and development of the Visible Camera (VIS) on the Euclid mission.

3. Euclid. III. The NISP Instrument: Euclid's Near-Infrared Spectrometer and Photometer (NISP) functional and calibration requirements, integral components, and key properties.

4. Euclid. IV. The NISP Calibration Unit: NISP Calibration Unit design rationale, challenges, qualification process, and lessons learned, as well as a description of the flight unit (capabilities, performance and limits).

5. Euclid. V. The Flagship galaxy mock catalogue: a comprehensive simulation for the Euclid mission: the Flagship galaxy mock, a simulated catalog of billions of galaxies designed to support the scientific exploitation of the Euclid mission.

6. Euclid preparation. I. The Euclid Wide Survey: the building of the reference Euclid Wide Survey --- the sequence of pointings, deep fields, and calibration fields, as well as the corresponding spacecraft movements.