Muri
Muri is the lean term for overburden — pushing people, equipment or processes beyond their reasonable capacity. It causes breakdowns, errors, safety incidents and burnout, and is one of the three lean enemies.
Muri results from demanding more than a resource can sustainably deliver: machines run past their rated duty, people worked beyond safe limits, processes loaded above stable capacity. It is often the consequence of mura, when peaks in uneven demand force everything into overload. Reducing muri through levelling, standard work and sensible loading improves reliability, quality and safety, and prevents the failures that overburden inevitably produces.