Difference Between Error And Mistake Proofing
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The Elsmar Cove Business Systems and Standards Discussion Forums > Common Quality Assurance Processes and Tools > Definitions, Acronyms, Abbreviations and Interpretations Error Proofing vs. Mistake Proofing - Differences? Forum User Name Keep error proofing vs mistake proofing Me Logged In Password Register Photo AlbumsBlogs FAQ Community Calendar Today's Posts Search mistake proofing examples Elsmar Cove Forum Visitor Notice(s) Some people have been having Password Reset issues (especially "Hotmail" accounts). If you have mistake proofing six sigma a problem, contact the Peachfarm Internet Properties IT techs directly at peachfarmllc {at} neomailbox.ch (Switzerland) and we will resolve your problem(s) within 12 hours. Hello, Unregistered! You are currently browsing the "Definitions, mistake proofing levels Acronyms, Abbreviations and Interpretations" forum. Unlike threads in the other forums, Discussion Threads in this forum are listed Alphabetically, rather than by 'Latest Post'. You can step through the pages to find the Definitions, Acronyms, Abbreviations and/or Interpretations you are looking for, or you can Search this forum with the Search This Forum search link. You can also Sort the listing in a number of
Mistake Proofing Definition
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defect-free all the time. It applies to any process where repetitive steps occur which could be skipped, performed out of order, or not conducted correctly. It ensures that tasks can only be
Mistake Proofing Exercise
done the right way. Anatomy Reference: Quality Planning and Analysis TerminologyA. Principle mistake proofing principles – There are 5 basic principles involved in mistake proofingB. Objective – The main difference between each of the mistake proofing ppt principlesC. How – A generic description of how the principle is implementedD. Preference – Always use the highest principle possible Planning - Part 1 PurposeTo serve as a guide to http://elsmar.com/Forums/showthread.php?t=19269 identify and implement mistake proofing devices to prevent errors or defects.Anatomy Reference: Quality Planning and Analysis TerminologyA. Details of Operation/Process Step, Product/Service or part identification and DateB. Description of the defect which is the subject of the exerciseC. Separate descriptions of where, in the process, the defect is first made and detectedD. Graph of the rate of defect production as http://www.free-six-sigma.com/mistake-proofing.html a function of timeE. Itemized list of process steps where defects are occurring. One step is entered in each boxF. For each defect-producing process step entered in the previous box, list the defects which occur at the specific stepG. For each defect-producing process step, list the possible causes for the production of the defectH. Red Flag Conditions - Provision for special accounting for particularly dangerous or costly defect/error situations. Root Cause of the error or defect Major ConsiderationsThe Chart assumes a reactive effort, i.e. a problem already exists. We should, however, use the tool in a proactive mode, stopping defects from ever occurring by mistake-proofing products, services and processes at the design stageApplication Cookbook1. Describe the defect or potential defect and indicate the defect rate2. Identify the operation where the defect is, or can be, discovered3. Identify the operation where the defect is, or can be, made4. Detail the sequence of events in the standard method or operation5. WATCH the operation being done and detail the steps that differ from the standard method6. Identify error conditions that could be contributing
The concept was first put to widespread use by Shigeo Shingo within the Toyota Production System (TPS).Objective:PREVENT a defect from occurring and when this is not possible, DETECT the defect every time one occurs. There are various levels, effort, and http://www.six-sigma-material.com/Mistake-Proofing.html costs of error proofing. The team needs to identify the optimal states and examine feasibility of implementation in the new product or process KPIV's. He recognized three types of poka-yokes: Contact method - identifies defects by testing product characteristics.Fixed-value - a specific number of movements every time.Sequence method - determines if procedure were followed. Defects found in later operations or steps of a process have more costs associated with them. There are more mistake proofing materials, labor, overhead, previously reworked product that are at risk. Ultimately if the product gets to the customer as a defect, the intangibles, such as reputation, can exceed the tangible cost.For example, a carbon monoxide detector will not be as effective if the inputs of dangerous and tolerable PPM levels are not known, or if the proper location for installation is not clear.GOOD: Detect defect before proceeding to next step.BETTER: Detects defects while difference between error in process at an operation.BEST: Prevent defects from occurring at all.Each process should have error-proofing to ensure defects are not passed on to the next step and that each operation has mistake proofing in place to ensure only defect free parts are accepted in. Connection to the FMEA The FMEA has three categories of:1) Severity2) Detection3) OccurrenceMistake Proofing is applied to reduce the scores in Detection and Occurrence.Once a mistake proofing device or method is proven it is important that the GB/BB follow up with the Quality Department to update the company FMEA if applicable. Risk reduction is another soft savings benefit from a Six Sigma team (reducing the RPN number of a failure mode).The Six Sigma team also updates their own project FMEA and this becomes the Revised FMEA in the CONTROL phase. Examining the Cost of Defects Their is an initial cost to implementing poka-yokes just like their is a significant cost to implementing SPC. However, this cost will be more than offset in the long term stability and performance of the output. In other words, if the correct poka-yokes are invested these will help reduce variation and shift the mean (or median) in the desired direction.The chart below show the basic costs at various levels of DETECTION. The further downstream a defects goes un