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J

jidoka

The Japanese term referring to the quality control process with four steps:

  1. Detect the abnormality.
  2. Stop.
  3. Fix or correct the immediate condition.
  4. Investigate the root cause and install a countermeasure.

Jidoka is one of two pillars in the House of Toyota, the other pillar being Just in Time (JIT).

Reference: Rosenthal, M. (2011). The Essence of Jidoka. Society of Manufacturing Engineers (SME), online at http://web.archive.org/web/20110714222919/http://www.sme.org/cgi-bin/get-newsletter.pl?LEAN&20021209&1&

job shop

Production system that accommodates making one-of-a-kind products whereby processing stations (machines) are laid out by functional grouping so that each unit being produced is likely to have to follow a jumbled flow from one to the next, according to the processing steps it requires.

→ see batch flow for an illustration

Just in Time (JIT)

Delivery of input to a customer just prior to when the customer needs it.

Just in Time is one of two pillars in the House of Toyota, the other pillar being jidoka.

JIT gets used to refer to the TPS itself.