6. Tool's functioning and its utility
Providing a guideline
The symptom has been defined and quantified.
The Customer who experienced the symptom has been identified.
Preventing any disruptions in the process
Having both long-term and short-term views
Management is committed to dedicate the necessary resources to fix the
problem at the root-cause level and to prevent recurrence.
7. Context of use
The 8D use is typical when:
• The complexity of problem exceeds the ability of one person (an expert)
• Needed cross-functional efforts and communication
• The customer or management requests 8-D
However, the 8D is not effective for:
• Non-recurring problems or quickly solved problems by individual effort.
• Problems with known root causes.
• Making a decision between different alternatives.
• Problems with the simplest and most obvious solution
8. Strengths and limitations
Some strengths of the 8D include:
prevent the full effect from impacting customers and/or employees
prevent defective parts from reaching the customer
Robustness of the solution is an essential characteristic
prevent recurrence of the problem
Document any history of plan, result, and projects
Disadvantages
Although it is simple and easy to use, it needs education
9. Corrective Action
Example
Problem
•"The customer just informed us of 25 defective units that failed on its line. We
have to start collecting data, while the parts are on the way..."
containment
actions
•100% visual inspection and sorting.
•100% measurement of a given characteristic.
•100% extended test for the affected technical defect (e.g. In-circuit test, electrical function test).
•Blocking of stock in the supply chain, or recall action (line, warehouse, customer’s warehouse, etc.) for
inspection.
The Root Cause
•Slimming of one blade of the CNC Number E1956
Corrective
Action
•Changing the blade
•having one spare blade as a safety stock
Preventive
actions
•duplicate the inspection samples after machining process
•Test Blades after each work shift
