Quality Flashcards
Quality
Quality -
Conformance to requirements and fitness for use
Quality Planning
Quality Planning -
Identifying the QUALITY STANDARDS and the METHODS to MEET THEM
Quality Assurance
Quality Assurance -
Doing AUDITS, MEASUREMENT COMPARISONS, IMPROVEMENTS and checking appropriate STANDARDS.
Overall PROCESS IMPROVEMENTS and not about inspecting the product for quality or measuring defects!
Quality Control
Quality Control -
Comparing actual results to standards, measuring and testing errors, measuring schedule performance.
Marginal Analysis
Marginal Analysis -
Optimal QUALITY is REACHED at the point where:
INCREMENTAL VALUE from IMPROVEMENT = INCREMENTAL COST to secure it.
Statistical Independence
Statistical Independence -
When the OUTCOMES of TWO PROCESSES NOT LINKED TOGETHER or dependent upon each other, they are called statistically independent.
Example: coin toss - the previous “heads” or “tails” has no consequence upon the next toss.
Mutually Exclusive
Mutually Exclusive -
Statistical term that states one choice EXCLUDES the others.
Example: tossing a coin can’t be both “heads” AND “tails”.
Attribute Sampling vs.
Variable Sampling
Attribute Sampling vs. Variable Sampling -
Attribute Sampling: binary - the outuput either conforms to quality or it does not.
Example: my car passing the smog test.
Variable Sampling: measures how well the outputs conform to quality.
Example: rating a batch of a product rated on a continuous scale, such as bottle water being produced in factory.
Special Causes
Special Causes -
In a CONTROL CHART considered UNUSUAL and PREVENTABLE by PROCESS IMPROVEMENT.
Common Causes
Common Causes -
In a CONTROL CHART considered ACCEPTABLE and UNTREATABLE.
Standard Deviation
Standard Deviation -
How spread out the numbers are from the average
3 and 6 Sigma Values
3 and 6 Sigma Values -
68.25% of values will fall within 1 sigma from the mean.
95.46% of values will fall within 2 sigma from the mean.
99.73% of values will fall within 3 sigma from the mean.
99.99966% of values will fall within 6 sigma from the mean.
Cost of Quality
Cost of Quality -
Cost of NOT doing it RIGHT the FIRST time!
Three types of COSTS:
- Prevention Costs - costs associated with satisfying customer requirements by producing a product without defects.
- Appraisal Costs - costs expended in examining, inspecting, or testing the product or process to ensure requirements are being met.
-
Failure Costs - What it costs when things don’t go to plan:
- Internal - scrap, re-work, expediting
- External - warranty, servicing, recalls
7 Basic Quality Tools Used in Plan Quality Management and Control Quality
7 Basic Quality Tools -
- Pareto Chart
- Flow Charts
- Cause-and-effect Diagram
- Control Chart
- Check Sheet
- Histogram
- Scatter Diagram
In Plan Quality Management they are discussed and decision to use or not to use, and how to be used. In Control Quality they are put into action.
Pareto Diagram
Pareto Diagram -
7QC Tool
DEFECTS rated from GREATEST NUMBER of occurrences to LEAST NUMBER of occurrences.
What is this diagram?
Pareto Diagram -
7QC Tool
DEFECTS rated from GREATEST NUMBER of occurrences to LEAST NUMBER of occurrences.
Flowcharting
Flowcharting -
7QC Tool
How various components relate in a system.
Shows how a process or system flows from beginning to end, how the elements interrelate, alternative paths, outputs.
What is this chart?
Flowcharting -
7QC Tool
How various components relate in a system.
Shows how a process or system flows from beginning to end, how the elements interrelate, alternative paths, outputs.
Cause and Effect Diagram
(Fishbone / Ishikawa)
Cause and Effect Diagram (Fishbone / Ishikawa) -
7QC Tool
Cause found by looking at problem and asking “why” until ROOT CAUSES are determined