Hello,
I knew the prevention is keeping errors out of the process and Inspection keeping errors out of hand of customer.
I knew also prevention is better/ cheaper than inspection as the inspection need rework/extra cost ( expensive).
A PM planning for tolerances ( range of acceptable result), However to usually to detect defects and correct them before they send them to customer to verify, this process might take time and cost.
from your experiences how should you plan and set up the tolerances?
If you are using 6 sigma in your project then, take into your information about 3.4 defects per 1M (6 Sigma is about 99,9999996666)
Please give me your thought and best experiences?
BR, Saving Changes...
you have to look at (at least) three things to establish such tolerances:
1. What are the customer/industry specifications. Those should generally always be outside of your tolerance levels.
2. What is the cost of improved quality relative to the cost of poor quality.
3. What is the relative importance of high quality compared to other success criteria for the product or service in the industry? Will a customer pay more or choose your company over another because of higher quality.
Senior Projects Manager | Field & Marten AssociatesNew Westminster, British Columbia, Canada
Mansour
In my understanding, Prevention is to be proactive and take precautions so errors do not happen rather than leave things for inspection, discover errors and correct them.
As for the 6 Sigma, no one uses that much high of a sigma except for industries that are high profile and can’t afford any error like Aerospace and Healthcare. All other industries uses 3 Sigma (Thats the normal range) otherwise if they use 6 sigma their cost will be extremely high which will reflect on the product price.
Thanks for your thought and recommendations brothers.
BR, Saving Changes...
Sergio Luis ConteHelping to create solutions for everyone| Worldwide based OrganizationsBuenos Aires, Argentina
Is not something is better than others. Both has to be done. Why focus will be con prevention? Because inspection is on the finished product, when things are out of the production line and fixing errors at this type cost 10-100 times than prevent those errors. Inspection must be done from the very begining of the process. For example, today that Agile is a buzzword, the approach was implemented in software field with the aim to detect deviations from requirements. With that said, all this is on the field of quality and quality is a matter of organizational strategy. While quality is composed for quality and grade you will find lot of companies that made an strategy delivering products with low quality and they are on the top three (you can find examples in the software domain mainly). So, all your plans are driven by the strategy of the organization on the matter and that must be defined by business. In some business the organization could use 6sigma while into other it has no sense and infact it could made the company will be out of that business. I am writting this not only from the academic is from my practical experience. Saving Changes...
Thanks Sergio for your sharing.
Appreciate it.
BR,
Mansour
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1 reply by Sergio Luis Conte
Mar 08, 2020 6:46 AM
Sergio Luis Conte
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You are welcome.
Saving Changes...
Sergio Luis ConteHelping to create solutions for everyone| Worldwide based OrganizationsBuenos Aires, Argentina
Mar 08, 2020 6:41 AM
Replying to MANSOUR THABET ALQUBATY
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Thanks Sergio for your sharing.
Appreciate it.
BR,
Mansour
You are welcome. Saving Changes...
VIJAY VISHWAKARMAAssistant General Manager - IT| Symphony LimitedMumbai, Maharashtra, India
Prevention is better, if cost and time devoted on prevention it leads to First time Right output. which in turn reduces the chances of rework.
so if we compare the cost, rework cost is much higher that of prevention cost. Saving Changes...
PINAKI BANERJEEProgram Director| ITC INFOTECH USA INC.Plainsboro, Nj, United States
The best way will be to identify the key impacts that you may want to target as part of prevention (process than verified during Inspection). Usually, 10% of defects cause 80-90% of the impact. It will always be better to identify these 10% of the defects and work towards preventing them as part of your process activities (prevention). This will not only help create a realistic process set-up, but also minimize the impact of any defects that are discovered during inspection. All this is subject to what Kiron mentioned earlier: Industry you are working in, Cost of improving quality vs. cost of inspection etc. Saving Changes...
Peter RapinSubject Matter Expect; Project Delivery| Independent ConsultantOntario, Canada
Prevention and inspection are not interchangeable.
Prevention is Quality Control (QC)
Inspection is Quality Assurance (QA)
Inspection is to confirm that the level of prevention meets predetermined criteria.
So, if the intent of the prevention program was to achieve 90% pass then inspection will confirm that 90%. The intent is not to use inspection to increase the 90% to 95% by rejecting 5% of the product. If you want 95% pass, do so with prevention, not inspection. Saving Changes...
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