2012 Cadence Innovation Lean 
International Institute for Learning
APRIL 19, 2023
They build on lean-agile thinking, and standard Scrum, Kanban, and DevOps practices. Dean Leffingwell released the first version of SAFe in 2012. Full SAFe extends the framework to Large Solutions that require coordinating many ARTs and implementing Lean Portfolio Management. Interestingly, Dean also worked at Rational.
Agilemania
DECEMBER 13, 2021
Scaled Agile Framework is a knowledge base of proven, integrated principles, competencies for attaining business agility using Lean, Agile, Systems Thinking, and DevOps. The groundwork for SAFe was formed in 4 knowledge areas – agile software development, lean product development, systems thinking, and DevOps. How does SAFe Work?
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