The development of system functionality is accomplished via multiple teams in a synchronized Agile Release Train (ART), a standard cadence of timeboxed iterations that are date and quality fixed but scope variable. The ART produces releases (or potentially shippable increments (PSIs)) at frequent, typically fixed, 60 to 120 per day time boundaries.

The release is to the enterprise what iterations are to the team the basic iterative and incremental cadence and delivery mechanism for the program. It is important to note releases can be delivered to the customer, or not, based on the business context (not discussed here).