Quality Glossary Click here to go to the homepage
The three fundamental steps of recording, recalling and reconstructing which most innovators go through when generating new product ideas.

Rational Subgroup
A rational subgroup is one in which the samples are selected so that the chance for variation due to special causes occurring within a subgroup is minimized, while the chance for special cause variation between subgroups is maximized. The key item to remember when developing a sampling plan is that the variation between subgroups is going to be compared to the variation within subgroups. Taking consecutive samples for the subgroups minimizes the opportunity for the process to change and should minimize the within-subgroup variation. The sampling frequency will determine the opportunity the process has to change between subgroups. The variation within a subgroup represents the piece-to-piece variation over a short period of time. Any significant variation between subgroups would reflect changes in the process that should be investigated for appropriate action. Source: AIAG SPC Manual

Random Sample
A sampling method whereby each service output in a lot has an equal chance of being selected.

Random Sampling
A method of looking at a few individual items in a lot to determine the quality of that lot against a standard.

Red Rabbit Test
used to check how long it takes to identify a defect. In this test, a red part is added to the mix and the time until it is discovered is identified.

Registered Suppliers
Registered Suppliers are suppliers who have received third party registration to a specific quality system standard for the commodity supplied.

The probability that an item will continue to function at customer expectation levels at a measurement point, under specified environmental and duty cycle conditions.# of tests to pass - Confidence Reliability Reference - Pocket Card

Reliability Apportionment
See Apportionment.

Rengi System
formal decision process

Response Surface Method
a technique to find maximum or minimum condition - the basic strategy is in considering the graph (similar to contours on a topographical map) of the yield as a function of tthe two significant factors. The higher the hill, the better the yield.

Action taken on nonconforming product so that it will meet the specified requirements.

Risk Analysis
Risk analysis has a primary purpose of answering two questions - 1. what can go wrong? and, 2. if something does go wrong, what is the probability of it happening & what are the consequences?

Robust Design
The design of products to be less sensitive to variations, including manufacturing variation, environment and abuse, increasing the probability that they will perform as intended. It is an integrated system of tools and techniques that are aimed at reducing product or process performance variability while simultaneously guiding that performance towards an optimal setting. Robustness measures are usually implemented for designs that are new so that the best values of the critical functional parameters are uncovered. Robust Design follows the methods first proposed by Genichi Taguchi. click here for P-Diagram

Rolled Throughput Yield
Probability that a product will pass through the entire process without rework and defects. It is the product of the First Time Through (FTT) of all process steps.

Root Cause Investigation
Steps involved in conducting a good root cause analysis - 1. understand the goal of the analysis and be objective, 2. obtain a clear understanding of the failure, 3. clearly identify all possible root causes, 4. evaluate the likelihood of each root cause, 5. converge on the most likely root cause, 6. clearly identify and evaluate all possible corrective actions, 7. select the optimal corrective action, 8. verify the corrective action(s)

Run Order (vs. Standard Order)
Randomizing the standard order (to create a "run order") to determine the order in which run the combinations. (used in DOE)

U V W X Y Z Acronyms
Food for Thought !
Search This Site
Custom Search
translate bookmark ©2007 | updated: 1/16/10
translate to french :: courtesy google translate to german :: courtesy google translate to italian :: courtesy italian translate to portugese :: courtesy google translate to spanish :: courtesy google translate to chinese :: courtesy google translate to japanese :: courtesy google translate to korean :: courtesy google translate to turkish :: courtesy google
Add http://www.thequalityportal.com to your delicious accountAdd http://www.thequalityportal.com to your digg accountAdd http://www.thequalityportal.com to your furl accountAdd http://www.thequalityportal.com to your reddit accountAdd http://www.thequalityportal.com to your myyahoo accountAdd http://www.thequalityportal.com to your sync2it accountMeneame
About Us | Contact Us | Visitor Comments