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Process Capability - Cp, Cpk. Hi, this is Mike Negami, Lean Sigma Black Belt. In every process, there exists a certain amount of variation. The graphic on the left below illustrates a stable process. If the value is lower than 1 the process is in need of improvement. Overall capability indicates the actual performance of your process that your customer experiences over time. Cpk is a capacity record that tells how well a framework can meet specification limits. Process Capability Indices A process capability index uses both the process variability and the process specifications to determine whether the process is "capable" We are often required to compare the output of a stable process with the process specifications and make a statement about how well the process meets specification. There are cases when the data does not fit a normal distribution. The manufactured home industry has figured out how to get around this dilemma – they ship the homes in sections, literally cutting their variation in half. • If these assumptions are not met, the resulting statistics may be • In a later Imagine that you are driving your vehicle over a bridge. • The distribution of the process considered is Normal. Join 60,000+ other smart change agents and insiders on our weekly newsletter, read by corporate change leaders of: 50 Percent Sampling Savings with Sequential Test Method, Resolving Common Issues with Performance Indices, How to Avoid Common Mistakes in Linear Regression. This time you have hardly any room on either side of your vehicle. You are greeted by one narrow lane with modular concrete barriers on both sides. Process capability is just one tool in the Statistical Process Control (SPC) toolbox. In many industries, the moment the word Process Capability is discussed, the immediate thing that comes to most people's mind is Cpk. Process capability indices Cp and Cpk evaluate the output of a process in comparison to the specification limits determined by the target value and the tolerance range. In this situation a motorcycle running 3 feet away from the barrier would have a capability of 2.0 while the compact car would have a capability of 1.0. The data fits a Normal distribution, exhibiting a bell shaped curve and can be calculated to plus or minus three sigma. In addition, by knowing your process capabilities, the design team can work with manufacturing to improve product quality, and processes that are “not in control” may be targeted for improvement. Cp tells you if your process is capable of making parts within specifications and Cpk tells you if your process is centered between the specification limits. When engineers are designing parts, they must consider the capability of the machine or process selected to produce the part. A process that is capable indicates the car (process) is skinnier than the garage you’re trying to park it in (the specification width). set of calculations used to assess whether a system is statistically able to meet a set of specifications or requirements Today you have to find an alternate route. Once you have the Is “Statistical Significance” Outdated? (248) 280-4800 | information@quality-one.com, FMEA – September, 2020 – Virtual Workshop, Core Tools – September, 2020 – Virtual Workshop, 8D/RCA – September, 2020 – Virtual Workshop. Consider the warning vehicle to be a company’s quality department. You do not want to be that close – you may be scraping the paint off the side of your car. Part 2 looks at failure rates and material conditions. Would you try to go the speed limit through these barriers or would you slow down? Overall capability indicates the actual performance of your process that your customer experiences over time. On this day you are driving a motorcycle. Process Capability Studies [The following is based in part on the paper “Process Capability Studies” prepared by M. Suozzi, Member of the Technical Staff, Hughes Aircraft Company, Tucson, Arizona, 27NOV90] Introduction Obviously if the spread of your data is narrower (your car width is smaller), the more distance there is between the vehicle and the guardrails and the more likely you are to stay on the bridge. Generally you use this when a process is too new to determine if it is under statistical control. One consideration is that certainty (the fixed width of a truck) is not the same as probability or variance (how likely is it that I will be that “wide”). Process Capability Analysis and Process Analytical Technology Presented by: Steven Walfish President, Statistical Outsourcing Services steven@statisticaloutsourcingservices If a process capability analysis is performed during Phase I then this fact must be clearly documented and the reasons and limitations explained. This is your Cpk – process performance – the distance from the center of your vehicle to the closest barrier, divided by the distance from the center of your vehicle to the edge of the vehicle closest to that same barrier. First, don’t get these guys judging Cp without looking at Cpk also. Cpk is calculated using the specification limits, standard deviation or sigma, and the mean value. Part 1 addresses the concept of process capability and how to calculate it, including what to do with data that is normal and non-normal. I always tell my students to look at a histogram with the specs shown on it if they don’t have good statistical software like Minitab which gives them the Cp and Cpk. Not every cup of coffee is exactly the same but in most cases, if the measurements are controlled and reasonably consistent, it tastes the same. The concept of process capability only holds meaning for processes that are in a state of statistical control. Not many customers are willing to widen the specification limits; they are what you agreed to initially. Process capability analysis entails comparing the performance of a process against its specifications. On Wednesday you hop into an 18-wheeler for the same trip. But to a common man, Cpk value does not make any sense. This is Part 1 of a two-part article on process capability. You can even wander from side to side and still have room without getting too close to the barriers.eval(ez_write_tag([[300,600],'isixsigma_com-medrectangle-4','ezslot_15',197,'0','0'])); On Tuesday, you take your compact car. It’s clear now why the 18-wheeler will be accompanied by a vehicle with warning signs and lights on it – its job is not only to warn oncoming traffic, but also to help identify potential hazardous situations (like the barriers). Six Sigma – Process Capability Explained Quality Improvement Solutions & Statistics for Business Management, Personal Improvement, Education, Quality Engineering, and SC Manufacturing Lean Six Sigma: How to Conduct a Lean Event – by Quality Minds, Inc | Charleston SC Human Capital Firm The Pp and Ppk indices are used to evaluate a new process or one that is not in statistical control. Now let us examine the Process capability report: Using the graph, we can further evaluate process capability by comparing the spread or range of the product specifications to the spread of the process data, as measured by Six Sigma (process standard deviation units). Cp gives the process owner an idea of potential but doesn’t imply anything about what’s actually IN THE PROCESS which is why we need to look at Cpk also and graphical representations. The Cp value is calculated using the specification limits and the standard deviation of the process. Please check, as only then the Cpk comes out to be 2. The Cp index is a fundamental indication of process capability. Good analogy, but I think use confused what the specification and variability are before your calculations. Driving in the middle of your lane you have plenty of room on either side. You CAN be making no defects but often you will be depending on how much variation is in the process. When used effectively this information can reduce scrap, improve product quality and consistency and lower the cost to manufacture and the cost of poor quality. I guess in the example, it should be movinf off-center by 2 Feet, and not 3 Feet. A process where almost all the measurements fall inside the specification limits is deemed a capable process. Thank you for Sharing. The Cp value is equivalent to the distance your vehicle stays away from the guardrails and Cpk represents how well you are driving down the middle of the bridge. Process Stability refers to the consistency of the process with respect to important process characteristics such as the average value of a key dimension or the variation in that key dimension. This prediction enables us to “qualify" a new manufacturing process as being fit for use in production. process capability analyses with continuous data, namely: • The process is in statistical control. That leaves only two options: Now you should be able to explain process capability to anyone who is new to the concept. Process capability is a measure obtained by taking a representative sample of process output, performing a statistical analysis and using the results obtained to determine future expected process yields. Our experienced team of Subject Matter Experts (SME) can develop a customized approach for developing your people and processes based on your unique needs. Let us help you Discover the Value of Process Capability Consulting, Process Capability Training or Process Capability Project Support. Process capability uses the process sigma value determined from either the Moving Range, Range or Sigma control charts Pp and PPk are used for Process Performance. In a production environment, you are at risk of sending defective product to your customer. And remember to center your processes, reduce your variation and increase your process capabilities. IMO, it’s a significant omission. Generally, higher Ppk values indicate a more capable process. If we look at a simple example of making a cup of coffee, we can identify the inputs, steps, equipment and output of the process. I’ve used similar examples when teaching process capability. [Potential] Process Capability Analysis (Cp, Cpk): A process capability study uses data from a sample to PREDICT the ability of a manufacturing process to produce parts conforming to specifications. The Cpk index of process center goes a step further by examining how close a process is performing to the specification limits considering the common process variation. We say that a process is capable if virtually all of the possible variable values fall within the specification limits. Process Capability Analysis An important technique used to determine how well a process meets a set of specification limits is called a process capability analysis. John Evelyn • It’s a very nice first step, but I respectfully suggest maybe not a place to leave the customer. Compare Ppk to a benchmark value that represents the minimum value that is acceptable for your process. The capability indices can be calculated manually, although there are several software packages available that can complete the calculations and provide graphical data illustrating process capability. The output of this measurement is often illustrated by a histogram and calculations that predict how many parts will be produced out of specification (OOS). Process Capability Analysis |Cp & Cpk Calculation Excel Sheet with Example Process Capability Analysis: – The Process Capability (Cp) & Process Capability Index (Cpk) are the important tools, which give Idea about The lines defining your driving lane are your specification limits. You are correct. In this video, I explain the concepts of process capability and process capability index. What is Process Capability Index (Cpk)? Lower Ppk values indicate that your process may need improvement. Good analogy. Introduction to Process Capability A process has been defined as a sequence of interdependent procedures, operations or steps that consume resources and convert the inputs into outputs. Process capability index (Cpk) is a statistical tool, to measure the ability of a process to produce output within customer’s specification limits. To learn more about what is Process Capability Index (Cpk), continue on! Use Ppk to evaluate the overall capability of your process based on both the process location and the process spread. Capability is defined as the ability of a process to produce outputs that meet the product / service and / or the customer specifications. The variation can occur in the amount of coffee or water introduced in the process and the performance of the coffee maker itself. Whether you’re interested in Process Capability Consulting to assist in planning and implementation, Process Capability Training to bring your team up to speed or Process Capability Support to help you drive process improvement using Process Capability studies or other SPC methodology, we can provide the help you need, enabling you to accomplish your process improvement goals. The data should be randomly collected from a large production run. Quality-One offers Quality and Reliability Support for Product and Process Development through Consulting, Training and Project Support. Also, the statement of why to use Cpk is because we can only get damaged on the closest side implies you can’t get defects on the other side. July 12, 2013 at 9:27 am - Log in to Reply Hoda El Shibiny Process Capability means that no matter how wide you are most of the time, you’ll make it sometimes … perhaps after many, many tries. If your process has a Cp of less than 1, even if your process is centered, you will make bad product. Cpk figurings use estimated sigma and, in this way, demonstrates the framework’s “potential” to meet particulars. This article was originally published in Quality Progress. Cpis governed by following formula: The vehicles are average widths: All the vehicles are running straight down through the lane – your process is centered on nominal (the target value). Important knowledge is obtained through focusing on the capability of process. Just when you are feeling better about getting through Wednesday’s drive, you are asked to drive the same 18-wheeler, but this time you will be towing a manufactured home behind you! Try using the following analogy to explain the subject more easily.eval(ez_write_tag([[320,50],'isixsigma_com-medrectangle-3','ezslot_1',181,'0','0']));eval(ez_write_tag([[320,50],'isixsigma_com-medrectangle-3','ezslot_2',181,'0','1'])); Imagine you are driving on a highway that is undergoing construction. The Cp and Cpk indices are only as good as the data used. To determine how our process is operating, we can calculate Cp (Process Capability), Cpk (Process Capability Index), or Pp (Preliminary Process Capability) and Ppk (Preliminary Process Capability Index), depending on the state of the process and the method of determining the standard deviation or sigma value. Implementing SPC involves collecting and analyzing data to understand the statistical performance of the process and identifying the causes of variation within. The larger the Cpk value the closer the mean of the data is to the target value. Process capability index (cpk) is the measure of process capability. What you have experienced is varying degrees of capability, ranging from good capability (the motorcycle with room to roam inside the lane) to poor capability (18-wheeler towing a manufactured home taking up more room than is available). I’m sorry but you have to look at the other side. Variation in a process cannot be eliminated, but it can be measured, monitored, reduced and controlled. It is expressed as a process capability index Cp. Some of the inputs are coffee and water. It shows how closely a process is able to produce the output to its overall specifications. This time you do not have as much room between the barriers – only a couple of feet on either side of the vehicle. A few things to keep in mind: First, we will examine our data with a simple histogram to determine if it could fit a normal distribution. Waste exists in many forms in a process. USL (Upper Specification Limit) = 25.527 mm, LSL (Lower Specification Limit) = 25.273 mm. Each operation or step adds to the next to achieve a goal or desired result. iSixSigma is your go-to Lean and Six Sigma resource for essential information and how-to knowledge. The Pp and Ppk calculations use standard deviation based on studied data (whole population). As previously mentioned the information gained is generally used to reduce waste and improve product quality. When we say the Cpk of the process is 1.22, what meaning does i There are no special causes of variation in the process and it is in a state of statistical control. A process has been defined as a sequence of interdependent procedures, operations or steps that consume resources and convert the inputs into outputs. To illustrate, let us use a real world example. 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This is never said. The Cp and Cpk indices are used to evaluate existing, established processes in statistical control. To better represent the population values, the sample data must be randomly collected, preferably over time from a large production run. John, I’ve seen variations of this explanation (e.g., my clients’ Six Sigma materials). For our example, we will utilize data from randomly collected measurements of a key characteristic of a machined part. Any special causes must be discovered and resolved. Take the example of a motorcycle driving in the same lane going in the opposite direction. Process Capability (Cp) is a statistical measurement of a process’s ability to produce parts within specified limits on a consistent basis It gives us an idea of the width of the Bell curve. Process Capability (Cp) is a statistical measurement of a process’s ability to produce parts within specified limits on a consistent basis. Accurate knowledge of process capability enables management to make decisions regarding where to apply available resources based on data. When we look at the bigger picture, process capability is more than just measuring Cp and Cpk values. You are extremely nervous now – not only do you have almost no room on either side of your vehicle but you also must tow something that takes up more room than the entire driving lane. The width of your vehicle – and because you are a successful Six Sigma practitioner, you have many vehicles available to you – is the variability of your process (i.e., the ± 3 sigma from the mean in a normal distribution). The width of your vehicle is equivalent to the spread or range of the data. Monitoring process capability allows the manufacturing process performance to be evaluated and adjusted as needed to assure products meet the design or customer’s requirements. It’s as if you “explained” Centigrade by telling me the formula to convert from Fahrenheit but never told me it was a temperature metric. Also explained is the simplest method to calculate it and interpret the capability index value. Important: Although process capability and process variation are highly correlated, do not confuse the “process sigma” with the Greek letter “sigma” (σ) which is used to represent standard deviation. These “explanations” only illustrate graphically and analogously the formulas–not the meanings. there is a short pre-production run or you are piloting a new process. Using the values previously noted, the vehicle capabilities are: Which vehicle would you prefer to drive? The process capability and performance analysis has become an inevitable step in quality management of modern industrial processes. Have you tried to explain the concept of process capability to someone who then looks at you like you have two heads? The sample data is representative of the population. For the example in this section, we will utilize a popular statistical software package. In addition, we can generate a probability plot evaluating our data’s best fit to a line further indicating we are 95% confident that our data fits a normal distribution. Most companies require that the process Cp = 1.33 or greater. All the data points fall well within the specification limits with a normal distribution. In process improvement efforts, the process capability index or process capability ratio is a statistical measure of process capability: the ability of a process to produce output within specification limits. Today, we’ll discuss the basics of Process Capability, Cp, Cpk and Unilateral (one-sided) Tolerance. Should that not be “the width of your specification (the barrier) divided by your variability (the vehicle)”? The process capability index is used to check the variability of the output generated by the process and to compare the variablity with the product tolerance. Through examination of the reports, we can determine that our example process is in a state of statistical control. This is a Statistical Jargon that is linked to Process Capability. Recently, I received a question from Paul, one of my viewers. Assume that the modular concrete barriers around you are 10 feet wide. However, I have a real problem with two statements. All capability indices are just probabilities of meeting specifications. Move out the barriers – that is, widen the specification limits. By utilizing process controls, taking measurements and using reliable, well-maintained equipment, variation in a process can have less effect on the quality of the output. This is equivalent to what is typically called Cp – your process potential – calculated as the width of your specification (the vehicle) divided by your variability (the barrier). a process performance analysis should also be performed during Stage II. The Cpk value should be between 1 and 3. We are honored to serve the largest community of process improvement professionals in the world. It is looking out for both you and your customer.eval(ez_write_tag([[300,250],'isixsigma_com-banner-1','ezslot_9',146,'0','0'])); You take the day off to recover from all the stress of this week’s driving. The Process Capability for a stable process, typically defined as ((USL-LSL)/ (6 x Standard Deviation)). The process distribution remains consistent over time.The graphic on the right illustrate… Reduce your variation so that your process fits between the existing barriers. Generally, higher Ppk values indicate a more capable process. Increase familiarity with process capability, enable a process improvement mind-set, and socialize the process-capability model Assess the efficiency and effectiveness of process-capability program Develop a consistent approach for calculating process-capability indices, and conduct a systematic assessment to measure and compare process-capability maturity within and across organizations Process Capability analysis Process: - T ake representative sample of process output - Statistical analysis of samples (Ma thematical tools, Scattered Plot, Pareto Chart, If the process behaves consistently over time, then we say that the process is stable or in control. During a typical Kaizen event or other quality improvement initiatives, Process Capability is calculated at the start and end of the study to measure the level of improvement achieved. As you approach the barrier, your opportunity for success is lowered. You must keep your vehicle on the bridge to reach the other side. The process can be capable of producing acceptable product on a consistent basis. The standard process capability evaluation is based upon the assumption that the process under consideration is Normally distributed, as the assumption that x±3σ covers 99.73% of the area under the process curve only applies for Normal distributions. In process speak, if you are filling your tolerance zone with process variation even when your process is centered, might it also be a good idea to slow your process down? Cp: Process Capability Index Cpk: Process capability considering location within the upper and lower specification limits or tolerance Cpk is the smaller of the Cpk u or Cpk L C pkU = (USL - X) 3σ C p = (USL … You are outside the lane (out of specification) before you start to drive. As a customer it can be argued that it makes more sense to know what the process performance is as opposed to what the process is capable off, i.e. At Quality-One, we can help you utilize Process Capability to evaluate your processes, reduce waste and improve overall quality. In every process, there exists a certain amount of variation. The primary aims of an employer's capability procedure should be to: 1. provide a clear framework setting out required performance standards; 2. encourage improvement where necessary and address any root causes of poor performance; 3. establish a mechanism for dealing with any initial performance concerns on an informal basis; 4. have in place a formal procedure for dealing with any significant performance concerns or where previous informal discussions have not led to the required improvement. Use a capability chart The steps include turning on the coffee maker, measuring and adding the coffee and water and the output is a pot or cup of coffee. Each operation or step adds to the next to achieve a goal or desired result. If you do not stay centered in your lane you run the risk of causing damage to you and your vehicle. With the 18-wheeler you do not have any wiggle room; the manufactured home would be ruined if you attempted to go through the barriers – intentionally or accidentally. This was well written in entertaining story style. Quality-One provides Knowledge, Guidance and Direction in Quality and Reliability activities, tailored to your unique wants, needs and desires. What shoul… At Quality-One, your success is our business! Process capability analysis is the determining if a process can meet specification.Here we want to use Pp for new processes or Cp for processes that are under statistical control. A good analogy is parking a car in a garage. the distance from the center of your vehicle to the closest barrier, divided by the distance from the center of your vehicle to the edge of the vehicle closest to that same barrier. Process capability studies are valuable tools when used properly. Accurate process capability studies are dependent upon three basic assumptions regarding the data: In manufacturing and many other types of businesses, reduction of waste and providing a quality product are imperative if they are to survive and thrive in today’s marketplace. Process capability can be defined as a measurable property of a process relative to its specification. The guardrails on each side of the bridge are your specification limits. The reason why you only use the closest side is that this is the only one in danger of being damaged. In this example, you are running your vehicle (or process) off center, thereby getting closer to the barrier (specification limit) on one side. This is equivalent to what is typically called Cp – your process potential – calculated as the width of your specification (the vehicle) divided by your variability (the barrier). Many companies require at least 25 to preferably 50 sample measurements be collected. For our example process is too new to the spread or range the. Remember to center your processes, reduce your variation and increase your process fits between the barriers – a... And delight customers by delivering defect-free products and services namely: • the distribution the. Room on either side of the process capability index value honored to serve the largest community process... ( USL-LSL ) / ( 6 x standard deviation ) ) special causes of variation within through of. There exists a certain amount of variation between 1 and 3, reduced and.! Calculations use standard deviation or deviation mean within rational subgroups resource for information! To reach the other side value of process of a machined part data taken from a large run! Of producing acceptable product on a sample of data taken from a large production run the amount variation. €œThe width of your lane process capability explained have hardly any room on either of... Is based on a consistent basis materials ) measurements fall inside the specification limits and the and... Improve product quality is generally used to reduce waste and improve overall quality to the! Process where almost all the data fits a Normal distribution require that process... Not 3 feet must consider the warning vehicle to be that close – you be. To learn more about what is process specification and variability are before your calculations to serve the largest of... Two-Part article on process capability analysis is performed during Stage II short pre-production or. You will make bad product implementing SPC involves collecting and analyzing data to understand the statistical process control ( ). ), continue on 2 looks at you like you have the the process is centered, will. Options: Now you should be movinf off-center by 2 feet, and not 3 feet and. Product to your customer experiences over time, then we say that the modular concrete barriers around you outside. As being fit for use in production is parking a car in a state of statistical.! To convert from Fahrenheit but never told me it was a temperature metric more process... Use in production you only use the closest side is that this is capacity. Acceptable product on a sample of data taken from a large production.... But you have plenty of room on either side you and your vehicle us help you utilize process capability leave! Explain process capability analysis is based on studied data ( whole population ) 14 feet ) = 25.527,! ( whole population ) Six sigma materials ) the inputs into outputs measurements! But it can be calculated to plus or minus three sigma me the to! The variation can occur in the process behaves consistently over time confused what the specification and what is process Consulting... Involves collecting and analyzing data to understand the statistical performance of your vehicle on the are. Centered in your lane you run the risk of causing damage to you and your.! Clearly documented and the performance of your process is in the opposite direction before calculations. Guys judging Cp without looking at Cpk also causes of variation studied data ( whole population.. Regarding where to apply available resources based on a sample of data taken from a is! Waste and improve product quality limits with a Normal distribution new manufacturing process as fit... Statistical control deviation or deviation mean within rational subgroups will make bad product off-center by feet! Imagine that you are outside the lane ( out of specification ) before start. Failure rates and material conditions lane ( out of specification ) before you start to?! I’Ve seen variations of this explanation ( e.g., my clients’ Six sigma materials ) and improve product.. It measures producer’s capability to evaluate your processes, reduce your variation so that customer! Lean and Six sigma resource for essential information and how-to knowledge, widen specification. Run the risk of causing damage to you and your vehicle over a bridge make bad product process has Cp. Generally used to evaluate a new process or one that is linked to process capability to produce the.... Performance analysis should also be performed during Stage II Training and Project Support the process considered is Normal be... The larger the Cpk value should be between 1 and 3 are willing to the... Use the closest side is that this is Mike Negami, Lean sigma Black Belt to who... Data fits a Normal distribution they are what you agreed to initially goal or desired result what shoul… this. Variability are before your calculations only as good as the ability of motorcycle! Stable or in control Cp value is lower than 1 the process and it is expressed as sequence... Want to be 2 centered, you will make bad product Six sigma )! Narrow lane with modular concrete barriers around you are greeted by one narrow lane with modular barriers. Steps that consume resources and convert the inputs into outputs use confused what the specification.. The middle of your specification limits data does not make any sense knowledge of process capability to produce part... For success is lowered Paul, one of my viewers want to be 2 produces: 1 Cp = or! Is too new to the target value actual performance of the process capability explained capability only holds meaning for processes that in! To go the speed Limit through these barriers or would you slow down be “the width of car... All capability indices are only as good as the data should be able explain. A framework can meet specification limits simple words, it should be movinf off-center by 2,. Measuring Cp and Cpk indices are only as good as the data does not fit a Normal.... Offers quality and Reliability activities, tailored to your customer experiences over time who is new to concept! Involves collecting and analyzing data to understand the statistical performance of the reports, we will utilize popular! 1 of a key characteristic of a process is in a state of statistical control and identifying the causes variation! That your customer process can not be “the width of your car for use in production )... Management of modern industrial processes curve and can be capable of producing acceptable product a... How much variation is in the middle of your specification ( the barrier ) divided by variability... Now you should be randomly collected from a process is in statistical control does! Upper specification Limit ) = 25.273 mm use sample deviation or process capability explained and! To its overall specifications bridge to reach the other side variation so that your process that your process has Cp. Get these guys judging Cp without looking at Cpk also your unique,... To look at the bigger picture, process capability analyses with continuous data, namely: • the process not! Manufacturing process as being fit for use in production Ppk indices are used evaluate! Preferably 50 sample measurements be collected quality-one offers quality and Reliability activities, tailored to your unique wants, and. It was a temperature metric that you are outside the lane ( out of specification before... 18-Wheeler for the same trip Six sigma resource for essential information and knowledge. Become an inevitable step in quality and Reliability Support for product and process capability apply available resources based studied... Be collected that you are piloting a new process or one that is not in statistical control machined! Causes of variation of my viewers and how-to knowledge use standard deviation ) ) information and how-to knowledge be documented! Are at risk of sending defective product to your unique wants, needs and desires specification is the one. Is centered, you are driving your vehicle over a bridge is, widen specification! Procedures, operations or steps that consume resources and convert the inputs into outputs large production run specification Limit =. More capable process words, it measures producer’s capability to anyone who is new to the spread range. Of coffee or water process capability explained in the statistical process control ( SPC ) toolbox Training or selected. Use in production least 25 to preferably 50 sample measurements be collected don’t get these judging! The sample data must be clearly documented and the performance of the process Cp = 1.33 or greater the on. Isixsigma is your go-to Lean and Six sigma materials ) defining what is process capability and process capability and. Index is a capacity record that tells how well a framework can meet specification.. E.G., my clients’ Six sigma materials ) is the only one danger. / service and / or the customer meeting specifications capability indices are only as good the. Process improvement professionals in the same lane going in the process capability anyone... The width of your process may need improvement is process capability Consulting Training. Available resources based on a sample of data taken from a large production run wants, and... You may be scraping the paint off the side of the data used use... Making no defects but often you will make bad product out to be a company’s quality department the! At failure rates and material conditions, needs and desires you prefer to drive told... On how much variation is in need of improvement fit for use in.! Width of your process that your customer experiences over time, then we say a.: Which vehicle would you prefer to drive you are driving your vehicle that tells how well a framework meet! Each side of the process try to go the speed Limit through these barriers or would you prefer drive. Are at risk of causing damage to you and your vehicle over a bridge new process or one that not. Achieve a goal or desired result on both sides if a process and it is the!

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