Difference Between Cp and Cpk

A process capability measures the potential of a process. That is its ability to produce a product within set limits.

/10

Business Quiz

Test your knowledge about topics related to business

1 / 10

In case of death or insolvency of a partner the firm is?

Dissolved

Carried on

New owner

None of the above

2 / 10

What is revenue?

The difference between the debit and the credit sides of an account.

Total sales during a stated period.

The money received by a business from customers.

All of the above

3 / 10

Which of the following countries are part of the WTO?

Afghanistan

Cambodia

Burundi

All of these countries are part of the WTO

Pakistan

4 / 10

Which country's currency is called the Baht?

India

Hong Kong

Thailand

Sweden

5 / 10

Who is the servant of the firm with a share in the profits?

Manager

Employee

CEO

Shareholder

6 / 10

Whose liability is limited to the extent of value of business assets and his private assets?

Partnership Firm

Sole Proprietorship

Co-Operative Society

HUF

7 / 10

Business-to-consumer (B2C) is also known as

Wholesale business

Retail sales

Consumer sales

8 / 10

Membership in a Co-Operative Society is?

Voluntary

Compulsory

Not Essential

None of the above

9 / 10

Office is a place where ___________.

office work is done

employees are housed

records are kept

control is situated

10 / 10

In business, stakeholders are defined as:

Only the people that purchase goods or services from a business.

Just the vendors that sells to the business.

All the people who stand to gain or lose by the policies and activities of a business.

Only the employees that are effected by the policies of a business.

Your score is

Summary

Cp and Cpk are such process capability indices.

Cp vs Cpk

The difference between Cp and Cpk is that Cp analyzes the ability of a process to justify the structured specification for a product. While Cpk portrays the deviation of a process from the center within the tolerance range. Cp is termed as Process Capability. Cpk is Process Capability Index.

Cp also known as Process capability is the statistical calculation of a process’s ability to produce a product within a given set limit. It is the ratio of the total specification to the total effective range.

The capability of a process is proportional to its magnitude. The higher the Cpk, the higher is the efficiency of the process.

Comparison Table

Parameters of Comparison	Cp	Cpk
Name	Process Capability.	Process Capability Index.
Definition	Cp is the capacity of the process to abide by the strategic classification for a product.	Cpk estimates the variation of the process from the center inside the tolerance range.
Magnitude	Cp is either equal to Cpk or greater than Cpk.	Cpk is always less than Cp.
Formula	Cp = (USL-LSL)/6	Cpk = (Xdbar- LSL)/3 ORCpk = (USL-Xdbar)/3
The minimum value (for a capable process)	1.0 – 1.33	2.00

What is Cp?

Cp is one of the process capability indices. It is called Process Capability. Process capability (Cp) is a statistical evaluation of a process’s capability to produce products within a determined limit.

Cp is the ratio of the ‘voice of the customer’ to the ‘voice of the process. It depicts the range of the process and lets us judge its effectiveness.

Evaluation of Cp

Cp = Total specification (or Tolerance)/ Total effective range (or natural variability)

Cp = (USL-LSL)/6, here USL = Upper Specification Limit; LSL = Lower Specification Limit; = standard deviation.

For instance, if you are preparing a canvas, its width and breadth must be considered. To be precise products must have a specific measurement or structure.

What is Cpk?

Cpk is the process capability index. It is the measure of how well a process is centered within the specified limit. It implies the capability of a process.

It depicts the localization of the process as well. Cpk is the minimum of Cpl, Cpu. Cpl and Cpu are process potential (one-sided).

Cpl = – LSL/3, Cpu = USL-/3. Here is the target of the process. A good process has a larger Cpk. Negative Cpk means the process has exceeded the given specification.

Condition for a perfectly centered process is

Cp = Cpk .

Main Differences Between Cp and Cpk

Cp is the difference between USL and LSL divided by 6. Cpk equals to (Xdbar- LSL)/3. or (USL-Xdbar)/3.Here USL is Upper Specification Limit. LSL is Lower Specification Limit.
Cp must be at least 1, Cpk must have a minimum value of 2

References

One request?

I’ve put so much effort writing this blog post to provide value to you. It’ll be very helpful for me, if you consider sharing it on social media or with your friends/family. SHARING IS ♥️