Program Increment (PI) Planning is a cadence-based, preferably face-to-face event that serves as the heartbeat of the teams, aligning all the teams to a shared mission and Vision. PI planning is essential to SAFe: If you are not doing it, you are not doing SAFe (source: The PI Planning is done every quarter (at the end of Qx for Qx+1) and takes two full days. It is important that all (complete) teams, with staff and contractors, participate since together they have to draft a trustworthy delivery plan – including dependencies between the teams, e.g. because they need the same resources – for the starting quarter. The reason that the complete teams should participate is that only then you can get commitment of the people that really have to do the work. It is checked at the end of day 2 of the PI Planning by a so-called ‘Confidence Vote’. A high Confidence Vote by the people really doing the work means a higher chance of delivering as planned.