What is Quality Control Charts?

396 reads · Last updated: December 5, 2024

A quality control chart is a graphic that depicts whether sampled products or processes are meeting their intended specifications. If not, the chart will show the degree by which they vary from specifications. A quality control chart that analyzes a specific attribute of a product is called a univariate chart, while a chart measuring variances in several product attributes is called a multivariate chart. Randomly selected products are tested for the given attribute(s) the chart is tracking.

Definition

A quality control chart is a graphical tool used to display whether sampled products or processes meet their expected specifications. If they do not meet specifications, the chart shows the degree of deviation from the specifications. By analyzing specific attributes of a product, quality control charts help identify and correct issues in the production process.

Origin

The concept of quality control charts originated in the early 20th century, developed by Walter A. Shewhart in the 1920s. While working at Bell Labs, he first proposed using statistical methods to monitor and control the quality of production processes.

Categories and Features

Quality control charts are mainly divided into univariate and multivariate charts. Univariate charts are used to analyze specific attributes of a product, while multivariate charts measure variations in multiple product attributes. The advantage of univariate charts is their simplicity and ease of use, suitable for monitoring single attributes; multivariate charts are suitable for complex product quality analysis but require more data and complex analysis.

Case Studies

Case 1: Toyota Motor Corporation uses quality control charts on its production lines to monitor the dimensional accuracy of car parts. By real-time monitoring and analysis, Toyota can quickly identify and correct deviations in the production process, ensuring product quality. Case 2: Samsung Electronics uses multivariate quality control charts in its semiconductor manufacturing process to monitor multiple key parameters, such as temperature and pressure. This approach helps Samsung improve product yield and production efficiency.

Common Issues

Common issues include how to choose the appropriate type of control chart and how to interpret anomalies in the chart. A misconception might be that all anomalies need immediate correction, whereas some may be random fluctuations that do not require action.

Suggested for You

Refresh

The Lisbon Treaty, also known as the Treaty of Lisbon, updated regulations for the European Union, establishing a more centralized leadership and foreign policy, a proper process for countries that wish to leave the Union, and a streamlined process for enacting new policies.The treaty was signed on December 13, 2007, in Lisbon, Portugal, and amended the two previous treaties that established the foundation for the European Union.

Lisbon Treaty

The Lisbon Treaty, also known as the Treaty of Lisbon, updated regulations for the European Union, establishing a more centralized leadership and foreign policy, a proper process for countries that wish to leave the Union, and a streamlined process for enacting new policies.The treaty was signed on December 13, 2007, in Lisbon, Portugal, and amended the two previous treaties that established the foundation for the European Union.

Labor Intensive

The term "labor-intensive" refers to a process or industry that requires a large amount of labor to produce its goods or services. The degree of labor intensity is typically measured in proportion to the amount of capital required to produce the goods or services: the higher the proportion of labor costs required, the more labor-intensive the business.

Labor Intensive

The term "labor-intensive" refers to a process or industry that requires a large amount of labor to produce its goods or services. The degree of labor intensity is typically measured in proportion to the amount of capital required to produce the goods or services: the higher the proportion of labor costs required, the more labor-intensive the business.

Fast-Moving Consumer Goods

Fast-moving consumer goods (FMCGs) are products that sell quickly at relatively low cost. FMCGs have a short shelf life because of high consumer demand (e.g., soft drinks and confections) or because they are perishable (e.g., meat, dairy products, and baked goods).They are bought often, consumed rapidly, priced low, and sold in large quantities. They also have a high turnover on store shelves. The largest FMCG companies by revenue are among the best known, such as Nestle SA. (NSRGY) ($99.32 billion in 2023 earnings) and PepsiCo Inc. (PEP) ($91.47 billion). From the 1980s up to the early 2010s, the FMCG sector was a paradigm of stable and impressive growth; annual revenue was consistently around 9% in the first decade of this century, with returns on invested capital (ROIC) at 22%.

Fast-Moving Consumer Goods

Fast-moving consumer goods (FMCGs) are products that sell quickly at relatively low cost. FMCGs have a short shelf life because of high consumer demand (e.g., soft drinks and confections) or because they are perishable (e.g., meat, dairy products, and baked goods).They are bought often, consumed rapidly, priced low, and sold in large quantities. They also have a high turnover on store shelves. The largest FMCG companies by revenue are among the best known, such as Nestle SA. (NSRGY) ($99.32 billion in 2023 earnings) and PepsiCo Inc. (PEP) ($91.47 billion). From the 1980s up to the early 2010s, the FMCG sector was a paradigm of stable and impressive growth; annual revenue was consistently around 9% in the first decade of this century, with returns on invested capital (ROIC) at 22%.

Negotiable Instruments

A negotiable instrument is a signed document that promises a payment to a specified person or assignee. In other words, it is a formalized type of IOU: A transferable, signed document that promises to pay the bearer a sum of money at a future date or on-demand.Common examples of negotiable instruments include personal checks, cashier's checks, money orders, certificates of deposit (CDs), promissory notes, and traveler's checks. The person receiving the payment, known as the payee, must be named or otherwise indicated on the instrument. Because they are transferable and assignable, some negotiable instruments may trade on a secondary market.

Negotiable Instruments

A negotiable instrument is a signed document that promises a payment to a specified person or assignee. In other words, it is a formalized type of IOU: A transferable, signed document that promises to pay the bearer a sum of money at a future date or on-demand.Common examples of negotiable instruments include personal checks, cashier's checks, money orders, certificates of deposit (CDs), promissory notes, and traveler's checks. The person receiving the payment, known as the payee, must be named or otherwise indicated on the instrument. Because they are transferable and assignable, some negotiable instruments may trade on a secondary market.

Renewable Resource

A renewable resource is a resource that can be replenished naturally over time. As a result, it is sustainable despite its consumption by humankind.Renewable resources for the production of energy are considered especially important for their potential to replace non-renewable, or finite, resources. Additionally, renewable resources can offer cleaner energy solutions than those provided by non-renewable resources such as coal and fossil fuels.Examples of renewable resources include the sun, wind, water, the earth's heat (geothermal), and biomass.

Renewable Resource

A renewable resource is a resource that can be replenished naturally over time. As a result, it is sustainable despite its consumption by humankind.Renewable resources for the production of energy are considered especially important for their potential to replace non-renewable, or finite, resources. Additionally, renewable resources can offer cleaner energy solutions than those provided by non-renewable resources such as coal and fossil fuels.Examples of renewable resources include the sun, wind, water, the earth's heat (geothermal), and biomass.

Feasibility Study

A feasibility study is a detailed analysis that considers all of the critical aspects of a proposed project in order to determine the likelihood of it succeeding.Success in business may be defined primarily by return on investment, meaning that the project will generate enough profit to justify the investment. However, many other important factors may be identified on the plus or minus side, such as community reaction and environmental impact.Although feasibility studies can help project managers determine the risk and return of pursuing a plan of action, several steps should be considered before moving forward.

Feasibility Study

A feasibility study is a detailed analysis that considers all of the critical aspects of a proposed project in order to determine the likelihood of it succeeding.Success in business may be defined primarily by return on investment, meaning that the project will generate enough profit to justify the investment. However, many other important factors may be identified on the plus or minus side, such as community reaction and environmental impact.Although feasibility studies can help project managers determine the risk and return of pursuing a plan of action, several steps should be considered before moving forward.