Which increment is reviewed at the system demo?

The full system increment is reviewed at the system demo because it represents the collective progress made across all teams in the Agile Release Train (ART) towards developing the final product. The system demo serves as an opportunity to showcase this complete increment to stakeholders, allowing them to see how the integrated work from all teams delivers value and meets the defined objectives.

The purpose of the system demo is to validate that the full system functions as intended and to gather feedback for further development cycles. This aligns with the SAFe framework's emphasis on collaboration, transparency, and continuous improvement. By reviewing the full system increment, stakeholders can assess the overall progress and determine any necessary adjustments or enhancements for future iterations.

In contrast, the other increments, such as the portfolio increment, team increment, and value stream increment, focus on different levels of the SAFe framework and do not encapsulate the complete integration of all components, which is essential for understanding the holistic development process during the system demo.