HO10a-D4
PROBLEM SOLVING WORKSHEET
Problem Description for Felt Tip Marker
Problem Statement: Red Felt Tip Marker Leaks (What’s wrong with what) Problem Description
Object 1. Red felt tip marker Blue/Black/Green Other color felt markers
IS
IS NOT
Get Information
Defect 2. Leaks Totally dry
3.
Tip
Barrel (side) Bottom (base)
4.
Both our place and next door All other places/customers
Just us/Just next door
5.
No other places/customers
6. 7.
中华车First Seen Two weeks ago Daily
Before two weeks ago Just some days
8. 9. 10.
Continuing Last ten daily shipments Upon arrival
Stopped Just some daily shipments Develops later (on shelf) in supply room
e100vs11. 12. 13. 14.嘉德信
All red felt tip markers (100) All shipments All ten per day Slow drip
摩托之家Just some red felt tip markers (less than 100) Just some shipments Less than 10 per day Steady stream Pressurized stream
Answer Key: D2 Problem Description for Felt Tip Marker Case
HO10b-D4
PROBLEM SOLVING WORKSHEET
Comparative Analysis for Felt Tip Marker
Differences
1. Red Plastic 1. Red Ink 1. Strawberry Scent Added Powder
Changes
New Plastic Supplier
Dates
5 Weeks ago 2 Weeks ago 2.5 Weeks ago
3. Felt Material 3. Smaller Diameter 3. Chisel Tip Shape
New Felt Supplier No Change No Change
1 Week ago
6. New Outside Sleeve Packaging
6. New Outside Sleeve Packaging
Answer Key: D4 Comparative Analysis for Felt Tip Marker Case
HO10c-D4
PROBLEM SOLVING WORKSHEET
Root Cause Theories for Felt Tip Marker
a. New Plastic Supplier 1. Plastic is too porous…ink leaks through 2. Plastic reacts with ink causing cracks
b. New Outer Sleeve (New Color) 1. Squeezes felt tip markers…causes cracks
c. Added Powder 1. Changes viscosity 2. Eats the plastic 3. Eats the felt…causing channeling
d. New Felt Supplier 1. Ink short circuits around felt 2. Felt is not tight enough (in the barrel)
Answer Key: D4 Root Cause Theories for Felt Tip Marker Case
HO10d-D4
PROBLEM SOLVING WORKSHEET
Trial Run of Root Cause Theories for Felt Tip Marker
Test for Most Likely Cause (+) (-) (?) a1. Plastic is too porous… ink leaks through b. 1. a1. 2. b. c1. Added powder changes viscosity d. c1. + + d. e. f. e. f.
3. 4. 5.
+ +
+ + +
6.
-
+
7. 8. 9. 10.
+ + + +
+ + + +
11. 12. 13. 14.
兰博基尼视频+ + + -
+ + + +
Answer Key: D4 Trial Run of Root Cause Theories for Felt Tip Marker Case
HO14-D4
TRIAL RUN OF ROOT CAUSE THEORIES
Rationale for (-) and (?) Responses for Felt Tip Marker
IS/IS NOT # ROOT CAUSE THEORY (a1.) New plastic supplier supplies plastic that is too porous and ink leaks through 1. 2. 3. 6. 14. (-) Same plastic supplier for all felt tip markers so there should be leaks in other color felt tip markers (-) If the plastic is porous should see other kinds of defects (e.g., cracks) (-) If the plastic is porous should see leaks on the side and base, not just the tip (-) Should have seen leaking felt tip markers and other troubles five weeks ago when new supplier began (-) If the plastic is porous should see a steady stream of ink
G8D Report for Beaman Case (HAWK)
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