Stories are the primary means of expressing needed functionality in SAFe. They largely replace the
traditional requirements specification with new paradigms based on Lean-Agile development.
Stories are elaborated by a user-voice statement and acceptance criteria, and they are used to
describe the features and behaviors of the system at various levels of abstraction. Stories are also
testable, estimable, and prioritizable, which makes them suitable for planning and delivering value in
an iterative and incremental way. Reference: SAFe Requirements Model, What replaces detailed
requirements documents in agile?, What replaces detailed requirements documents in SAFe?
