Communicating and refining the Vision to the Agile Release Train (ART) during PI Planning supports the SAFe Core Value of Alignment. Alignment is one of the four core values of SAFe thatguides the behaviors and actions of the people who work under the framework1. Alignment means that everyone understands the strategic direction, the value streams, and the solution intent, and how their role and work contribute to them2.
PI Planning is a crucial event in SAFe where all the teams within the ART come together to plan their work for the upcoming Program Increment (PI)3. During PI Planning, the Product Management presents the Vision, which describes the future state of the solution and its features4. The Vision helps align the teams and stakeholders to a shared mission and goal, and provides the context and purpose for the PI objectives.
References:
*SAFe Core Values - Scaled Agile Framework
*Alignment - Scaled Agile Framework
*PI Planning - Scaled Agile Framework
*Vision - Scaled Agile Framework