Talk:Lean manufacturing/Archives/2018

Picture Model of the "lean production" system
Citation added. See commons:File_talk:Lean_manufactory_house.png --Laurensvanlieshout (talk) 17:15, 1 April 2018 (UTC)commons:User:Laurensvanlieshout


 * A citation from the Wikimedia Commons:
 * "I made this visualization of the lean manufacturing house after I studied various articles about it. I have also successfully applied the principle in practice. It is my personal interpretation how I see it. --Laurensvanlieshout (talk) 16:42, 1 April 2018 (UTC)"


 * Cheers! Jayaguru-Shishya (talk) 13:04, 3 April 2018 (UTC)

"Stockless production" or "zero inventories"
Greetings! At the moment, the article states that (boldings added): "Adherents of the Toyota approach would say that the smooth flowing delivery of value achieves all the other improvements as side-effects. If production flows perfectly (meaning it is both "pull" and with no interruptions) then there is no inventory; if customer valued features are the only ones produced, then product design is simplified and effort is only expended on features the customer values. The other of the two TPS pillars is the very human aspect of autonomation, whereby automation is achieved with a human touch." As there isn't even an appropriate source given to back up this part of text (only a reference Suprateek Roy (1988), something which has been tagged ever since June 2017, and a trace of which cannot be found from the Internet), I'd like to remove the part in question and its dependencies. By dependencies, I mean the very last sentence of the paragraph that would be let completely without a context (unsourced it is as well), as well as the very first one, thus being an orphan.

And not just for the lack of an appropriate source, I've found a few sources actually contradicting the idea of no inventories. For example:

"In retrospect, one could also argue that 'zero inventories' or 'stockless production' were misnomers given that Kanban scheduling does indeed require a certain amount of inventory to establish the 'pull' scheduling, albeit very little in comparison to the amounts of working-progress inventory that were commonly found in mass production facilities."

- Holweg, M. (2006) "The terms stockless production or zero inventories as synonyms for just-in-time are misleading and thus not used in this work. After all, the Kanban technique does require inventory in buffers at all production structure levels. The misunderstanding resulting from this misrepresentation is probably also responsible for the fact that JIT was frequently understood and applied incorrectly and that, finally, the new catchword "lean" took the place of the term JIT."

- Schönsleben, P. (2016) "The terms stockless production or zero inventories as synonyms for justin- time are misleading and thus not used in this work. After all, the kanban technique does require inventory in buffers at all production levels. The misunderstanding resulting from this misrepresentation is probably also responsible for the fact that JIT was frequently understood and applied incorrectly and that, finally, the new catchword lean took the place of the term JIT."

- Sharma, K. (2009)

Therefore, I think the removal of the paragraph would be highly justified. Cheers! Jayaguru-Shishya (talk) 14:39, 30 May 2018 (UTC)

Jayaguru-Shishya (talk) 14:39, 30 May 2018 (UTC)


 * "And it makes me wonder..." has Schönsleben, P. (2016) violated the copyrights of Sharma, K (2009), or the other way around...? Or what's the deal here...? I don't know who has published the 1st edition first, or if they've came into an agreement or something... Jayaguru-Shishya (talk) 14:45, 30 May 2018 (UTC)


 * "Suprateek Roy" Looks like vandalism of "Taichi Ohno" . --Ronz (talk) 15:34, 30 May 2018 (UTC)
 * I've cleaned it up. --Ronz (talk) 18:05, 30 May 2018 (UTC)


 * Thank you very much, Ronz! I was thinking who the heck is Suprateek Roy anyway... :-O That makes sense then. I've been improving the sources now a little, and provided quotations from the book where applicable. However, I still find the paragraph rather questionable. The tagged source still doesn't say anything about "smooth flow", "pull", "interruptions", "customer values", or "no inventory" (i.e. "stockless production" or "zero inventories"). Besides, we have a few sources that dispute the text. Should it be removed, though, we are left with two orphan sentences not really connected together, leaving the paragraph like this: "The Toyota production system has two pillar concepts: Just-in-time (JIT), and "autonomation". In this instance, the "human touch" means to automate so that the machines/systems are designed to aid humans in focusing on what the humans do best."


 * A good rule of thumb is that there should be at least three sentences per paragraph. This isn't any official guideline, though. Moreover, the last sentence also remain unsourced, as well detached from the very first one. Cheers! Jayaguru-Shishya (talk) 15:05, 1 June 2018 (UTC)

Definition
In 4.10.2018 the first sentence of the article stands as: "Lean manufacturing or lean production, often simply "lean", is a systematic method for waste minimization ("Muda") within a manufacturing system without sacrificing productivity." The part that lean would not sacrifice productivity is clearly a wrong statement as stopping the operation for improving halts productivity. Lean leads to greater productivity as the operation is improved by minimizing waste; there is no trade-off between these two. But in short-term the productivity is indeed sacrificed (for the long-term improvement). — Preceding unsigned comment added by 157.124.30.4 (talk) 10:54, 4 October 2018 (UTC)