Final answer:
The SAFe Lean-Agile Principle that supports applying a Set-Based design approach is 'Assume variability; preserve options'. This principle encourages flexibility and innovation by developing multiple design options and making decisions later in the process, based on feedback and learning.
Step-by-step explanation:
The SAFe (Scaled Agile Framework) principle that supports applying a Set-Based design approach is 'Assume variability; preserve options'. This principle is central to maintaining flexibility in the design process by developing multiple options and keeping those options open for as long as feasible. This approach allows a development team to gather more information and make more informed decisions as the project progresses, which is integral to the Lean-Agile mindset of continuously exploring, integrating, and adapting.
Set-Based design is a practice that keeps requirements and design options open while progressively narrowing the focus based on learning and feedback. It enables the teams to explore multiple paths, and therefore, they can converge on solutions that have greater potential value. The ability to keep options open until the last responsible moment helps to maximize the flexibility in the decision-making process, thereby enhancing innovation, risk management, and cost efficiency.