What is SPC
SPC is a method of monitoring a process during its operation in order to control the quality of products while they are being produced.
It involves gathering information about the product, or the process itself. This is done in order to identify special causes of variation and other non-normal processing conditions, thus bringing the process “ under statistical control” and reducing variation.
Statistical monitoring charts, including Shewart Chart, are commonly used, but other techniques are being introduced as well
Statistics is the science of collecting, organizing, analyzing and interpreting data for the purpose of making better decision
All process and systems exhibit variation, and one of the most important aspects of managing Quality are the management and reduction of variation.
What time did you reach your office every day? There is no simple way to answer this with a single time. You may reach usually say. 8.55 AM. But if you were to measure it every day, you would get a whole lot of different times. Quite a few of them may be 8.40 AM to 9.00 AM
Acknowledging and understanding variation is the fundamental aspects of quality concept. Variation is an important consideration in the quality, because more the things vary, the less we can be sure that our customers’ expectations are met.
We know that things will vary, yet we have to constantly work for reducing variation, so that our products and services become more consistent.
Statistics is the language of variation and everyone needs the have grasp of basics.
Common Causes :- These are random causes of variation, which are natural part of the system. Bringing changes in the system can change variation due to common cause.
Special Causes:- These causes are due to special circumstances that are not normally part of the system. They can usually be identified and fixed without changing the system
Man (people) – everybody does things differently.
Machines – using different machines – even different individual machines of the same model – might produce different results.
Method – different training emphasizes different things.
Materials – different materials (paper clips vs. large binder clips) produce different results.
Mother Nature (Environment) – differences in temperature, humidity, etc., can affect results.
Measurement system – the more accurate and precise the measurement tools the smaller the range of variation
SPC is a method of monitoring a process during its operation in order to control the quality of products while they are being produced.
It involves gathering information about the product, or the process itself. This is done in order to identify special causes of variation and other non-normal processing conditions, thus bringing the process “ under statistical control” and reducing variation.
Statistical monitoring charts, including Shewart Chart, are commonly used, but other techniques are being introduced as well
Statistics is the science of collecting, organizing, analyzing and interpreting data for the purpose of making better decision
All process and systems exhibit variation, and one of the most important aspects of managing Quality are the management and reduction of variation.
What time did you reach your office every day? There is no simple way to answer this with a single time. You may reach usually say. 8.55 AM. But if you were to measure it every day, you would get a whole lot of different times. Quite a few of them may be 8.40 AM to 9.00 AM
Acknowledging and understanding variation is the fundamental aspects of quality concept. Variation is an important consideration in the quality, because more the things vary, the less we can be sure that our customers’ expectations are met.
Statistics is the language of variation and everyone needs the have grasp of basics.
Common Causes :- These are random causes of variation, which are natural part of the system. Bringing changes in the system can change variation due to common cause.
Special Causes:- These causes are due to special circumstances that are not normally part of the system. They can usually be identified and fixed without changing the system
Man (people) – everybody does things differently.
Machines – using different machines – even different individual machines of the same model – might produce different results.
Method – different training emphasizes different things.
Materials – different materials (paper clips vs. large binder clips) produce different results.
Mother Nature (Environment) – differences in temperature, humidity, etc., can affect results.
Measurement system – the more accurate and precise the measurement tools the smaller the range of variation
