Final Exam - Chapter 16 Flashcards
What is quality control?
Ensure goods and services conform to specifications and meets customer requirements by monitoring and measuring processes and making adjustments to meet performance.
3 Components of quality control?
- Performance standard or goal
- Means of measuring performance
- Comparison of actual vs standard to form basis for corrective action.
Quality Source?
People responsible for work control quality and can stop the process of the source of the problem
Supplier Certification Management?
Ensure conformance to requirements before value-adding in the first place
In process Control
Ensure defective outputs do not leave the procFIniess and prevents defects in the first place Ex. While working it you control it checking on it at random times during WIP
Finished good control(Acceptance assembling technique)
Verifies the product meets customer standards Ex.Technique based, end of day have 1000 units in assembly line, you check a sample and infer it to population. Either you accept units or reject based on sample size
Prevent Sources of Errors
Mistakes in the first place using the poke yoke approach
Customer satisfaction measurement
Responses that are tied directly to key business processes
Statistical Process Control
A methodology for monitoring quality of manufacturing and service delivery processes to help identify and eliminate special/assignable causes of variation
Common (Natural Cause Variation)
Test Question Result of complex interactions of variation in materials, tools, machines, info, workers, environment.
What can eliminate common variation?
Nothing can eliminate common variation
Special (Assignable) Variation
Arises from external sources that are not inherent in the process. Ex. Poorly Trained Workers, Machine out of adjustment
Process in Control
Variation is normal
Process out of control
Variation is too large (Time to stop the machine)
Variable(Continuous Metric)
One that is calculated data that are measured on a continuous scale of measurement Ex. Cereal box size can measure 6.0 6.1 6.2
Attribute (Discrete Metric)
Calculated from data that are measure on a binary scale of measurement Ex. Percentage of time on arrival? Yes or no question performance is on time arrival therefore attribute
Statistical Process Control
Technique that involves testing a random sample of output from a process in order to detect if non random changes in the process are occurring ex. Used to monitor and see if you have assignable variation. Its a prevention technique
How many control charts for variable?
Need to use X^bar and R Chart Together
X^ chart
Average/Mean chart, measures central tendency
R Chart
Range chart, measures dispersion ex. average scores of R chart- How many passed? How many failed? Those are control charts for variables
P chart
Chart for attribute Use p chart to find out proportion defective
C chart
Defects per unit
What does it mean when a process is in statistical control?
It means it only has common natural variation. It does not have any assignable variation
Cpk question should you accept order or not
If Cpk= 1, then barely meets specs. If CPK< 1 the process does not meet.
what type of measure (variable or attribute)
On time variable
Discrete variable
