The Four Capabilities describe the organizational habits that distinguish companies which sustain lean transformations from those which regress. Drawn from research by Steven Spear on the Toyota Production System, they answer the question: what does an organization have to be good at, systemically, for lean to keep working after the consultants leave?
Every job is specified in enough detail that the expected outcome is a testable prediction. Standard work isn't bureaucracy, it is a hypothesis. When actual outcomes deviate from the standard, that deviation is a signal to investigate, not a reason to blame the operator.
When abnormalities appear, they are solved as close to the moment and place they occur as possible, by the people doing the work, supported by their leaders. The output of every problem-solving cycle is not just a fixed problem but new knowledge captured in the standard.
Improvements made in one team spread deliberately to every other team facing the same problem. This requires visible standards, active coaching, and forums where lessons are exchanged. Knowledge that stays in one head is knowledge that will be lost.
Leaders are teachers first and managers second. Their job is to build the problem-solving capability of their people through daily coaching, the Toyota Kata pattern. Without this, the first three capabilities decay within a generation of leaders.
Lean tools, Kanban, 5S, Andon, Kaizen, are visible. The Four Capabilities are the invisible discipline that makes those tools keep working. Organizations that master them improve continuously; organizations that adopt only the tools eventually slide back.
