MSG Team's other articles

11403 Strategic Finance – Meaning and Important Concepts

Introduction For an organization to succeed in the global and competitive world, it needs to have a robust strategic plan in place. The strategic plan is made of several definite targets it aspires to achieve. Some of the targets are internal (Productivity improvement, sound finance discipline, etc.) as well as external (EPS, Stockholder value, etc.). […]

11476 Systems Considerations in the Design of HRIS

For implementing any Human Resource Information System (HRIS) project successfully, the system design requirements should be given utmost importance and it must have scope for customizations as per the requirements of the end users. The system should have various inbuilt provisions and be developed by carefully analyzing the end users/customers’ requirements and the technicalities involved […]

12490 Business Process Improvement Project – Process Detailing Exercise

Business Process Improvement provides an excellent opportunity for Organizations to overhaul their existing operations, to increase efficiencies, eliminate wastage as well as to implement new and improved methods of working. The ground for BPI projects is not only with Organizations who aim to move from a people dependent operation to Process driven Organization but also […]

10913 Recovery Time Objective and Recovery Point Objective

The concept of insurance came about in the business field to cover the risk of loss of assets due to natural and manmade disasters as well as other calamities. In the current times, Organizations especially those which are dependant heavily on IT systems have begun to look at preventive steps as well as plan for […]

11670 BPI Project Tools – Different Types of Flow Charts

Business Process Improvement programs are an effective way of overhauling the business operations, of improving the efficiency, of bringing in change in the operations and lastly in enhancing the benchmark of the Business offering of the product or service to the Customer. In the fast changing business environment marked by technological advances, shortening lifecycle of […]

Search with tags

  • No tags available.

Just like there are many types of discrete data charts available, there are also many types of continuous control charts available. The Six Sigma process methodology prescribes which chart must be used when. The prescription in the case of continuous data points is largely based on sample size.

Below is the list of the different control charts that need to be used for different sample sizes:

Individual Chart: In the case of an individual data chart, each observation is plotted as a separate data point. This means that there is no rational subgrouping of data. This chart must therefore be used when the sample size equals 1.

Moving Range Charts: Unlike the individual data chart, the moving range chart plots the difference between two data consecutive points. The sample size of this type of control chart is therefore 2. Here the rational subgrouping of data points is based on whether they are consecutive. The moving range data charts therefore have one less data point as compared to the individual charts.

X Bar R Chart: The X bar and R chart are used to control a process when the sample size is small and constant. This is because in small sample sizes, the range of the sample approximates the standard deviation, which would be pointless to calculate, given the small size.

The X bar and R Chart are actually two different charts, which need to be looked in tandem to understand the behaviour of a process. The X bar chart shows the average performance of the process. The R chart which plots the difference between the smallest and largest value explains the variability of the process.

X Bar S Chart: The X bar and S charts are used when the sample size used to conduct the study is large and/or variable. As in the case of X bar and R chart, X bar and S charts too have a number of values. The X bar chart ensures that the mean of the process is in control whereas the S chart monitors the standard deviation. When used in tandem, they help monitor the performance of a very large process with relative ease.

Article Written by

MSG Team

An insightful writer passionate about sharing expertise, trends, and tips, dedicated to inspiring and informing readers through engaging and thoughtful content.

Leave a reply

Your email address will not be published. Required fields are marked *

Related Articles

Conducting the Knowledge Transfer

MSG Team

Closing a Six Sigma Project

MSG Team

Step 3A: Choosing the Correct Control Chart (Discrete Data)

MSG Team