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articles:pdca-the_origin [2022/03/15 08:27] – [The "Deming Cycle" revised... (1951)] rrandallarticles:pdca-the_origin [2022/11/24 09:39] (current) – [The Deming Cycle (1950)] rrandall
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 ====== PDCA - The Origin Myth ====== ====== PDCA - The Origin Myth ======
  
-The PDCA (plan–do–check–act) is an iterative design and management method used in business for the control and continuous improvement of processes and products. While the PDCA cycle/wheel is often attributed to W. Edwards Deming... or to a lesser extent, Walter A. Shewhart, neither Deming nor Shewhart created the PDCA cycle/wheel.+The PDCA (plan–do–check–act) is an iterative design and management method used in business for the control and continuous improvement of processes and products. While the PDCA cycle/wheel is often attributed to W. Edwards Deming... or to a lesser extent, Walter A. Shewhart, __neither__ Deming nor Shewhart created the PDCA cycle/wheel!
  
 Unfortunately, both of these men continue to be incorrectly attributed with the creation of the PDCA cycle/wheel through poorly researched articles and publications... which themselves are referenced and result in a perpetuation of this myth. Unfortunately, both of these men continue to be incorrectly attributed with the creation of the PDCA cycle/wheel through poorly researched articles and publications... which themselves are referenced and result in a perpetuation of this myth.
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 {{ :articles:shewhart-5_steps_in_the_operation_of_control.png?direct&600 |}} {{ :articles:shewhart-5_steps_in_the_operation_of_control.png?direct&600 |}}
  
-Upon reading the source materials, we recognize that it is quite a //stretch// to cite the PDCA as the same as the "Shewhart Cycle". Rather than a basis for continual/continuous improvement, Shewhart's "cycle" would be better described as a "closed-loop" self-correcting system intended to achieve "optimization" of a process +Upon reading the source materials, we recognize that it is quite a //stretch// to cite the PDCA as the same as the "Shewhart Cycle". Rather than a basis for continual/continuous improvement, Shewhart's "cycle" would be better described as a "closed-loop" self-correcting system intended to achieve "optimization" of a process __using a "Control Chart"__.
 ===== The Deming Cycle (1950) ===== ===== The Deming Cycle (1950) =====
-{{ :articles:1950_deming_cycle_transparent.png?direct&400|Deming Cycle introduced in 1950}} +{{ :articles:1950_deming_cycle_transparent.png?direct&350|Deming Cycle introduced in 1950}} 
-Inspired by the "Shewhart Cycle", W. Edwards Deming created his own "Deming Cycle", which he introduced in 1950 at a [[http://juse.or.jp/english/|"Japanese Union of Scientists and Engineers" (JUSE)]] sponsored eight-day seminar on statistical quality control for managers and engineers. His straight-line: Step 1- "Design", Step 2 – "Produce", Step 3 - "Sell" was converted to a circle with a fourth step added: Step 4 - "Redesign through marketing research".+Inspired by the "Shewhart Cycle", W. Edwards Deming created his own "Deming Cycle", which he introduced in 1950 at a [[http://juse.or.jp/english/|"Japanese Union of Scientists and Engineers" (JUSE)]] sponsored eight-day seminar on statistical quality control for managers and engineers. His straight-line: Step 1- "Design", Step 2 – "Produce", Step 3 - "Sell" was converted to a circle with a fourth step added, and Step 4 - "Redesign through marketing research".
  
-Deming stressed the importance of constant interaction among design, production, sales, and research and that the four steps should be rotated constantly, with quality of product and service as the aim.+Deming stressed the importance of constant interaction among design, production, sales, and research and that the four steps should be rotated constantly with the quality of product and service as the aim.
   - Design   - Design
   - Produce   - Produce
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   - Redesign through marketing research   - Redesign through marketing research
  
 +<note>One could argue that Deming should have described the "Deming Cycle" as having 3 steps since Step 4 rolls into Step 1 again for the "cycle".</note>
 ===== The "Deming Wheel" - created by Japanese executives (1951) ===== ===== The "Deming Wheel" - created by Japanese executives (1951) =====
  
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 ===== The "Deming Cycle" revised... (1951) ===== ===== The "Deming Cycle" revised... (1951) =====
-{{ :articles:1951_deming_cycle_transparent.png?direct&350|}}+{{ :articles:1951_deming_cycle_transparent.png?direct&300|}}
 Perhaps unaware that a group of Japanese executives had modified his original "Deming Cycle" (and renamed it the "Deming Wheel"), Deming modified his "Deming Cycle" in 1951 to add "Test". Perhaps unaware that a group of Japanese executives had modified his original "Deming Cycle" (and renamed it the "Deming Wheel"), Deming modified his "Deming Cycle" in 1951 to add "Test".
  
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 ===== The Deming PDSA Cycle (1986) ===== ===== The Deming PDSA Cycle (1986) =====
  
-In 1986, Deming reintroduced his "Deming Cycle" (which he stated was inspired by the iterative nature of the "Shewhart cycle"). He stated that the new PSDA Cycle came directly from the 1950 version. However, after reviewing the original "Deming Cycle", this new model is NOT the same. It appears that Deming was simply "going with the flow" since JUSE had credited him with the PDCA cycle, with a slight modification to improve it.+In 1986, Deming reintroduced his "Deming Cycle". He stated that the new PSDA Cycle came directly from the 1950 version. However, after reviewing the original "Deming Cycle", this new model is NOT the same. It appears that Deming was simply "going with the flow" since JUSE had credited him with the PDCA cycle, with a slight modification to improve it.
  
 {{ :articles:pdsa_cycle.jpeg?direct&400 |}} {{ :articles:pdsa_cycle.jpeg?direct&400 |}}
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 {{ :articles:dmaic-aug-2019-01.png?direct&800 |}} {{ :articles:dmaic-aug-2019-01.png?direct&800 |}}
  
-To enhance the effectiveness of DMAIC, many users incorporate TRIZ into the Analyze & Improve portions of the DMAIC process.+To enhance the effectiveness of DMAIC, many users incorporate [[articles:triz_application|TRIZ]] into the Analyze & Improve portions of the DMAIC process.
  
-[{{  :articles:2048px-40_principles_of_triz_method_720dpi.jpeg?direct&800 |40 principles of TRIZ. Copyright By FotoSceptyk – Own work, CC BY-SA 4.0, \\  https://commons.wikimedia.org/w/index.php?curid=45719323  }}]