In the lean principles philosophy, unexpected downtime is the result of unreliable processes.

Lean Principles

Principles associated with the lean enterprise that include reducing inventory, reducing lead time, reducing setup time, product-/customer-oriented layouts, employee involvement, pull scheduling, zero defects, and supply chain management.

Unexpected Downtime

Unplanned or unforeseen interruptions in a system's or facility's operations, leading to temporary cessation of services or production.

Unreliable Processes

Procedures or systems that fail to consistently perform to their designed specifications or standards, leading to errors, defects, or inefficiencies.