Introduction I’m obviously a big fan of the Agile methods and Lean/Kanban, as evidenced by how the teams on which I work, consult, or participate use aspects of each for their chosen processes. One of the underlying philosophies of both Agile and Lean/Kanban is the Theory of Constraints (ToC). The Theory of Constraints was developed by Eliyahu Goldratt in the early 1980s to describe how workflows can be understood and improved by focusing on the bottlenecks that constrain the flow of value through the system being measured.