1. once the Team has Completed the 4th Why
The 5th Why can be formed
once the Team has Completed the 4th Why
5th Why / Detection
Development
5th Why / Detection
Examples
5th Why / Detection
FMEA
5th Why / Detection
Cause & Effect (Fishbone)

3. Developing the 5th Why / Detection
5th Why / Detection Control
Development
Developing the 5th Why / Detection
Enter the Detection Control as well as the Detection Weakness
for each of the 3rd Why / Failure Modes
Enter a Detection directly into the cell/select from the drop down list if previously entered. Detection Controls are automatically added to the database. To Update/Edit/View the Database: Select ‘Add-Ins’, ‘Database Rankings’ , ‘Prevention Control DBS’.
With additional Pop up Aids

4. D4 - Developing the 5th Why / Detection …Options
Examples
D4 - Developing the 5th Why / Detection …Options
The 5th Why defines the Detection Method
of the 3rd Why / Failure Mode
Option 1: The Process Sequence Example ‘VALVE MANUFACTURING’
RAW MATERIAL
MACHINING
TAPPING
ASSEMBLY/ TEST
DESIGN/ APPLICATION

5. D4 - Developing the 5th Why / Detection …Options
Examples
D4 - Developing the 5th Why / Detection …Options
The 5th Why defines the Detection Method
of the 3rd Why / Failure Mode
Option 2: Any other logical method or sequence Example ‘BACK ACHE’
POSTURE
SPINAL COLUMN
MUSCLES
NERVES
ASSOCIATED ORGANS

6. Will automatically be updated
5th Why / Detection
FMEA
D4 – 5th Why =
the Detection
Will automatically be updated
5th Why / Detection
RAW MATERIAL
MACHINING
TAPPING
ASSEMBLY/
TEST
DESIGN/
APPLICATION
VALVE
BODY
ADAPTOR
CUTTING FLUID
SETTINGS
FOREIGN MATTER
VISCOSITY
SWARF
DIRTY CASTINGS
SAND IN CASTINGS
VISUAL APPEARANCE

7. D4 - The 5th Why / Detection will be forwarded to
C&E (Fishbone)
D4 - The 5th Why / Detection will be forwarded to
the Cause & Effect Diagram. It will appear on the left, according to the Failure Mode you have selected.
RAW MATERIAL
MACHINING
TAPPING
ASSEMBLY/
TEST
DESIGN/
APPLICATION

8. This completes the
D4 5th Why / Detection
Now start the
D4 Fault Tree Analysis