Expect to come across this popular question in Scaled Agile framework interview questions.   The SAFe House of Lean was derived from Lean Manufacturing originally, it has four pillars, a foundation, and the Goal. The goal of Lean is to deliver the maximum customer value in the shortest sustainable lead time while providing the highest possible quality to Customers and society as a whole. The below figure explains the Goal, Pillars, and Foundation of "SAFe House of Lean." Pillar 1 – Respect for People and Culture – There are approaches that cannot be implemented without human intervention, and the same applies to Lean-Agile. Hence, Respect for people and culture becomes a basic necessity. The driving force behind this behavior is the culture and it requires the enterprise and its leaders to change first.  Pillar 2 – Flow – The success of SAFe implementation lies on establishing a continuous flow of work that backs incremental value delivery based on continuous feedback and fine-tuning. Pillar 3 – Innovation - Flow creates a concrete groundwork for value delivery. But without innovation, both product and process will gradually deteriorate. For this reason, Innovation has been given a lot importance. Pillar 4 – Relentless Improvement – As with the other three pillars, this one too holds great value, it inspires new learning and evolution through constant reflection and process improvements.