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Basic Stability

Having essential capability, availability, and flexibility in the 4Ms -- manpower, machines, materials, and methods. A lack of basic stability in a process prevents improvements from either occurring or being sustained.

A process with basic stability is capable (able to reliably produce good parts but short of jidoka at each step), available (can produce when needed and at a pace with takt time), and flexible (able to change over a few items but short of every-part-every-interval (EPEx)).

Basic stability is required for the effective functioning of just-in-time (JIT) production, which often follows an implementation cycle of basic stability—flow—takt time—pull—heijunka. The cycle is repeated over and over as needed.

From the Lean Lexicon 5th Edition
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