A continuous production flow or adjustment to changing demand in terms of number and variety, created by achieving two main concepts: Just In Time and Jidoka. Two of these concepts is the main pillar of Toyota production system.
Just-In-Time (JIT) basically intends to produce the necessary units in necessary quantities and time required. Jidoka In Japanese terms, can be interpreted as control a defect in the autonomic system. Jidoka support by not allowing defective units from the previous process flow to the next process and messed it up.