100% Visual Sorting Effectiveness

J
#1
Thanks for checking this post.
I work with several doubting-Thomases that I need to prove something to. They think 100% visual sorting is 100% effective. I have been taught that (and it has been my experience that) it is usually only 85 to 90% effective, making 200% visual only 97% effective. Twice I have seen training tools that prove it. One was an 8½ X 11 sheet with a matrix of "o"s on it with a few "c"s mixed in for finding. The average person in the room found 85% of the "c"s on the page. The other time I saw it it was "f"s and "t"s, I think. Does anybody have this test that can supply me for our training session?
ie:
ooooocooooooooooo
ooooocoooocoooooo
oocoooooccoooocoo
ooooooocooooooooo
ooooooooooooooooo
oocoooooooooocooo
oooooooocoocooooo
 
Elsmar Forum Sponsor

Jen Kirley

Quality and Auditing Expert
Staff member
Admin
#2
Here's a site I found:

Count the F's
Objective:
To illustrate that people see what they want to see; items of prominence catch our attention while seemingly less important items may pass on by.

Procedure:
Pass out face-down copies of the following page to the group. When everyone is ready, ask them to turn the paper over and simply count how many times the letter "F" appears on their sheet. Allow only a minute, and then ask, how many of you have the sheet with the 5 F=s? (Roughly half the group can be expected to so indicate.) Then ask who has 6 F=s on their sheet?...How about7?... Does anyone have [email protected] (About 50% of the group will see only 3-4 F=s, and approximately 10% will see all 10 F's. The rest will see either 6 or 7 on the sheet.)

Alternative:
Ask those with 4, 5, or 6 F's on their sheets to raise their hands and let those with 3 F's exchange papers so they too can "see" all 10 F's. Most will still have a difficult time identifying all 10 of the F's.

Discussion Questions:

1. Why couldn't all of us initially see all 10 F's? (The F in the word "of" sounds like a "V".)

2. Have you observed situations where only the important things get attention? Who decides what's important?

3. How can we persuade people to pay more attention to detail? Is it always important?

Materials Required:
Card or sheet of paper with the statement as shown.

Approximate Time Required:
5-10 minutes

Source:
Unknown



Count the F's

____________________________________________________
OFTEN UNREALIZED, FEATURE FILMS

ARE THE RESULT OF YEARS

OF SCIENTIFIC STUDY COMBINED

WITH THE EXPERIENCE OF OVER FIFTY YEARS.
 
D

D.Scott

#4
While I agree with what you are saying, you must be careful not to paint every situation with the same brush. There was a study showing that 100% inspection was only about 85% effective but you have to consider what was being inspected. I agree your o's and c's can yield similar results but apply the same test to finding the red refrigerators in a line-up of white refrigerators. What would be the likely result? I certainly hope it would be better than 85%.

Dave
 
D

D.Scott

#5
OK Carol, I'll bite.

Quickly count the number of 'F's in the following text:



FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS





Wrong, there are seven.


Where is number 7 ????

Dave
 
T

ttownley

#7
Different than the first example which I disagree with because of "in the following text"- "Count the F" 's = number 10.
 

CarolX

Super Moderator
Super Moderator
#8
OK Carol, I'll bite.

Quickly count the number of 'F's in the following text:



FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS





Wrong, there are seven.


Where is number 7 ????

Dave
Dave - to tell you the truth - I never looked at this - I found this a few years ago - I think somewhere on this site - and I never even looked at it - :lmao: :lmao: :lmao:
 
J
#9
I think my question was mis-understood.
When sorting out the cracked parts in a lot of 10,000 parts of which only 1,000 are cracked most humans are capable of only finding 850 on the first pass. Then 127 of the remaining 150 on the next pass, and only 19 of the remaining 23 on the 3rd pass, etc. Somewhere in my many training sessions it was demonstrated to we non-believers by us looking at a sheet of about a thousand "o"s. Of the 1000 there were ~80 "c"s. (We weren't told that). We were asked to count the "c"s in one pass. The average came out to about 68 with most finding at least 60 and none over 75.

I am looking for that sheet of a thousand "o"s and an official count.
 
Thread starter Similar threads Forum Replies Date
A Injection Mold 100% Visual Inspection - Short Shots and Debris not being found Inspection, Prints (Drawings), Testing, Sampling and Related Topics 22
S Applying ANSI/ASQ Z1.4 given known lot size and 100% visual inspection AQL - Acceptable Quality Level 2
J Visual Inspection Not 100% Effective - How to Improve Visual Inspection Quality Tools, Improvement and Analysis 51
R 100% Visual Inspection - Would you Remove or Reduce the Visual Inspection? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 9
CarolX Accuracy of 100% Visual Inspection - Proofs Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
Ninja Windows 10 100 % disk use after update Coffee Break and Water Cooler Discussions 33
A 21 CFR part 11 - section 11.100 - Electronic Signature Certification Other US Medical Device Regulations 6
Stoic Manual soldering processes - 100% verifiable, or always requiring validation? 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 15
E Correct way to certify hydrostatic testing when it is not 100% (and Sample Size) Various Other Specifications, Standards, and related Requirements 6
A What to do when 100 % verification is not 100 % Manufacturing and Related Processes 5
Nicole Desouza ISO / AS Certification - Small business with less than 100 employees ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 7
M EU – Chemical Safety Report – CSR – REACH Authorisation decisions – Triton X-100 – Ortho-clinical-Use1 REACH and RoHS Conversations 0
D Measuring fine tubing (< 0.100") "Wall by weight" General Measurement Device and Calibration Topics 11
Marc Anniversary of the First Trans-Atlantic Flight 100 years ago - June 2019 Coffee Break and Water Cooler Discussions 2
Y IEC 62304 Section 4.3(a) - 100% probability of failure IEC 62304 - Medical Device Software Life Cycle Processes 3
BHobbs_Busche All Measurements taken with a Variable Gage have to be Recorded 100% IATF 16949 - Automotive Quality Systems Standard 14
Pmarszal Clarification for 21 CFR Part 11.100 - General Requirements Other US Medical Device Regulations 14
S 100% Final Inspection Requirements of Active Medical Devices (MDD or IEC Standards?) EU Medical Device Regulations 4
B Is Gage R&R required on a 100% Dimensional Layout? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 6
K IEC 61010-2-100 Labeling question - IVD equipment Other ISO and International Standards and European Regulations 1
D Long length measurement of 18" up to 100" with an accuracy of .005 min General Measurement Device and Calibration Topics 8
F Yield reaction higher than 100% Manufacturing and Related Processes 3
S Suggestions for a 100% Paperless Manufacturing Shop Floor Quality Tools, Improvement and Analysis 10
M Can OEE (overall equipment effectiveness) exceed 100%? Manufacturing and Related Processes 2
G Sampling Question - Random Sample of 100 pcs and 11 pcs. have been rejected Inspection, Prints (Drawings), Testing, Sampling and Related Topics 30
Marc 100 Years of Change in the United States - 1913 - 2013 Coffee Break and Water Cooler Discussions 5
E Is there a specific regulatory requirement for 100% inspection of IFUs? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
N Switch to 100% inspection when lot fails sampling? Inspection, Prints (Drawings), Testing, Sampling and Related Topics 9
K 100 years war aviation - A plane is used for bombing World News 3
S ATA (Aerospace Testing Alliance) Specifications 100, 200 and 300 AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 1
K SPC to apply for Particle in Clean Room Class 100 Statistical Analysis Tools, Techniques and SPC 7
N What Makes Life 100% (joke) Funny Stuff - Jokes and Humour 0
V Supplier Capability and 100% Sort causing Gage Wear APQP and PPAP 1
P Sample Size to Test Products used for 100 hours in a Test Environment Reliability Analysis - Predictions, Testing and Standards 2
R Problems with Supplier - Always with 100% Sorting - No Corrective Actions Supplier Quality Assurance and other Supplier Issues 22
R Why do outgoing QA Sample Testing again when Product is tested 100% Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
Ajit Basrur China to launch 100 rockets, 100 satellites by 2015 Coffee Break and Water Cooler Discussions 1
V PPAP - Requirements when Cpk is <1.67 - 100% Sort for Defectives APQP and PPAP 8
G Is Controlled Shipping requirement Sampling Based or 100% Inspection? Misc. Quality Assurance and Business Systems Related Topics 3
J MSA Emergency - PV%=100(PV/TOL)in American? And that is correct? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 13
C What to expect in a GE Aerospace Audit of a 100 Person Machine Shop Customer and Company Specific Requirements 5
R Research involving a very small population (100 approx) - Help with Sampling Statistical Analysis Tools, Techniques and SPC 3
N 100% Inspection in Retail Warehouse which Ships Products to Customers Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
P FDA Part 820 Clause 820.100 Corrective and Preventive Action 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 3
J Can a Major Nonconformance be Open but 100% Resolved? IATF 16949 - Automotive Quality Systems Standard 6
K 100% Inspection or do the usual IQ, OQ, PQ Validation - Medical Molding Design and Development of Products and Processes 3
C Cleanroom Class 8 (100,000) Particulate Control and Warning Limits Statistical Analysis Tools, Techniques and SPC 1
S 100 Places to Remember Before They Disappear Coffee Break and Water Cooler Discussions 8
J Functional Test Sampling - Determining Sample Size to eliminate 100% Testing Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
S Taking samples in a 100 cavity mold for Xbar-R chart Statistical Analysis Tools, Techniques and SPC 1

Similar threads

Top Bottom