Data Entry Errors

1
Data Entry Errors

• Summary
• by Craig K. Harmon

2
Bar Codes

• Replace manual entry
• Transportable Data
• Accurate Reliable
• - Key-entry 1 error in 300 characters
• - Bar Codes gt 1 in a million

3
Key-Entry Error Rates

• Character Error in 400 Characters Keyed
• Gilb, Tom and Weinberg, Gerald,
• "Humanized Input Technique
• for Reliable Keyed Input,"
• Winthrop Publishers, Inc.,
• Cambridge, MA, 1977

• Character Error in 200 Characters Keyed
• Michaels, Eugene S., Bell Laboratories
• Qwerty Versus Alphabetic Keyboards
• as a Function Typing Skill,
• Human Factors, Vol. 13, No. 5,
• 1977, pp 419-426

4
The Cost of Errors
Error Costs AMA - 27.00 (1980)
Error Costs DEMA - 72.00 (1983)
Error Costs 3M - 151.00 (1988)
5
Scanning Error Rates
Ohio University - Center for Automatic
Identification 1992 Worst Case Best
Case Symbology (95 Confidence Level) (95
Confidence Level) Code 16K 1 error in
5,400,000 1 error in 315,000,000 Code 49 1 error
in 5,300,000 1 error in 309,000,000 Code 39
w/Check Char 1 error in 2,500,000 1 error in
34,000,000 Code 128 1 error in 2,800,000 1 error
in 37,000,000 UPC-A 1 error in 394,000 1 error
in 800,000 1993 PDF417 - 0 in 35 million
characters Data Matrix - 0 in 35 million
characters
Code 39 (Intermec) 1 error in 2,700,000 (Good)
to 1 error in 70,000,000 (Excellent) Code 39
(LOGMARS Report 1981) 1 error in 3,379,000
6
Cost Reduction

• Purchase Order (Reynolds)
• - From 75.00 to 0.93
• Normally 101 Reduction
• ROI 1 to 2 Years

7
Cost to Process a Purchase Order
120.00
105
100.00
80.00
52
60.00
40.00
22
16
20.00
0.00
Manual
Computer
EDI
EDI with bar codes
8
3M Bar Code Scanning Benefits
Data Collection Productivity Net savings of
0.25 on each of 4 million transactions 1,000,00
0.00Shipping Error Reduction Reduce 6,500
errors at 75 cost, net savings 400,000.00Back
order Reduction Reduce 35,000 floor
backorders at 20 cost 700,000.00 Reduce
15,000 normal backorders at 20
cost 300,000.00Inventory Savings Reduce lead
time and variation resulting in 25 million
inventory reduction at 20 carrying
cost 5,000,000.00Total Savings 7,400,000.00
9
Thank You!!

• . . . Questions ???
• . . . craig.harmon_at_qed.org