4.1. QC, QA, TQM

What is the primary aim of Quality Control (QC)?

To identify problems and defects before product release

How does Quality Assurance (QA) fundamentally differ from Quality Control (QC) in its orientation?

QA is a process-oriented managerial tool, while QC is a product-oriented corrective tool

True or False: Quality Assurance is considered a corrective tool that identifies and fixes nonconformities.

False; QA is aimed at preventing defects, whereas QC identifies and fixes nonconformities

Which of the following best describes the "System" approach in quality management?

Quality Assurance, as it is an overall management plan to guarantee the integrity of data

What is the broader field that acts as the "over-all direction" and includes QA, QC, Quality Planning, and Quality Improvement?

Quality Management System

When distinguishing between the tools and the system, how are QA and QC categorized?

QA is the "System" that guarantees data integrity, while QC refers to the "Tools" used for analytical measurements

True or False: Quality Management System (QMS) extends beyond just the QA and QC system approach.

True; it is a broader field that also incorporates Quality Planning and Quality improvement

Which concept specifically deals with the inspecting, testing, and checking of products or services?

Quality Control

Which approach focuses on preventing nonconformities rather than identifying them after they occur?

Quality Assurance

Where were the seven basic Quality Control Tools initially developed?

Japan

True or False: The seven basic QC tools are used exclusively for final product inspection.

False; they are used to monitor overall operation and for continuous process improvement

Which QC tool is also known as the Ishikawa diagram?

Cause-effect diagram (Fishbone Diagram)

In the context of a Fishbone diagram, what distinguishes the "Main branches" from the "Minor branches"?

Main branches characterize major causes, while minor branches detail specific causal factors considered from root causes

What is the primary objective of using a Fishbone diagram?

To find and cure the cause of a problem, not just the symptoms

Which of the following correctly pairs the components of the 4M's and 4P's used in Fishbone diagrams?

4M's: man, material, method, machine; 4P's: policies, procedures, people, plant

True or False: The Ishikawa diagram assists in exploring and categorizing possible causes to lead to a more "robust" solution.

True; it organizes causes to discover root causes effectively

Which graphical technique ranks items in the order of the magnitude of their contribution?

Pareto Chart

How does the Pareto Chart prioritize problems differently than a simple tally sheet?

It highlights the significant/vital few causes of defects from the insignificant/trivial many using the 80/20 Rule

True or False: In a Pareto chart, data is sorted in ascending order of importance.

False; data is sorted in descending order of importance

In the construction of a Pareto Chart, what is represented by the line graph?

The cumulative percentage for each category

When identifying the "vital few" in a Pareto Chart, which data points are targeted?

Those causes that fall under the 80% cumulative percentage line

Which QC tool is described as a frequency distribution diagram represented by a series of rectangles?

Histogram

True or False: In a histogram, the height of the rectangle is proportional to its frequency.

True; the height indicates frequency while the base represents the range of the variate

Which tool is designed to determine whether a process will produce consistent measurable properties over time?

Control Charts

In a Control Chart, what do the Upper and Lower Control Limits signify compared to the Centerline?

The Centerline is the process mean, while the Control Limits are the boundaries values not expected to exceed unless there is a special change

True or False: If a plotted sample falls outside the established control limit on a Control Chart, the process is still considered stable as long as the next point returns to normal.

False; if a sample is outside the control limit, the process is no longer stable and corrections must be done

Which QC tool is used to study and identify the possible relationship between changes observed in two different sets of variables?

Scatter Diagrams

When analyzing a Scatter Diagram, what is the difference between a "narrow cloud" and a "wide cloud"?

A narrow cloud means the parameters are closely related, while a wide cloud indicates poor correlation

True or False: A Flow Chart is a pictorial representation showing all the steps of a process wherein input is transformed into an output.

True; it allows observations to be taken at each step to determine significant causes of problems

Which QC tool focuses on the systematic collection of data to ensure decisions are based on facts rather than anecdotal evidence?

Check Sheets

Why must the data collected in Check Sheets be classified?

For further analysis in order to obtain a meaningful output

What category of quality cost includes all costs of products which fail to comply with specifications?

Failure Cost

How does Internal Failure Cost fundamentally differ from External Failure Cost?

Internal occurs within the organization up to delivery, while External occurs after the product is transferred to the consumer

True or False: Failure cost is generally considered the smallest of the three quality costs.

False; it is considered the largest of the three quality costs

Which of the following is considered an Internal Failure Cost?

Scrap, Rework, or Corrective Operations, and Downgrading

True or False: Downgrading a product before it leaves the manufacturing plant is classified as an external failure cost.

False; it is classified as an internal failure cost because it happens before delivery

What type of quality cost covers all costs in checking that quality is right after the goods are made?

Appraisal Cost

Which scenario best distinguishes Appraisal Cost from Prevention Cost?

Appraisal involves inspections to eliminate defective work, while Prevention involves training personnel to ensure faulty work isn't made

Which quality cost includes the provision of full proof methods and the maintenance of equipment?

Prevention Cost

True or False: The cost of tests and inspections to monitor processes and keep them right is considered a Prevention Cost.

False; it is classified as an Appraisal Cost

Among the costs of quality, which one is incurred specifically to ensure that faulty work will not be made in the first place?

Prevention Cost

Supplier quality assurance and high-quality management fall under which cost category?

Prevention Cost

True or False: External failure costs are incurred in producing products of low quality.

True; failure costs (both internal and external) are incurred from producing products of low quality

If a company implements a robust training program for operators, which cost increases, and which cost is it attempting to decrease?

Prevention Cost increases, attempting to decrease Failure Costs

In the Pareto Chart example regarding potato chips, which graphical line identified the 80% threshold for the vital few defects?

The cumulative percentage line graph

How do Check Sheets and Pareto Charts complement each other in quality control?

Check Sheets systematically gather raw data on defects, which can then be ranked by magnitude in a Pareto Chart

True or False: A process is considered stable and in-control as long as the plotted values on a Control Chart randomly vary about the process mean without exceeding the upper or lower limits.

True; the values are expected to vary randomly within the known variance of the control limits

What is the primary characteristic of an "anecdotal" decision, which Check Sheets are designed to prevent?

It is based on casual observations rather than systematically collected facts

In Quality Management, how does Quality Planning relate to QA and QC?

Quality Planning, along with QA, QC, and Quality improvement, is a subset of the broader Quality Management System

True or False: Identifying and fixing nonconformities is considered a product-oriented action.

True; this describes Quality Control, which is a product-oriented, corrective tool