The 8D Troubleshooting Methodology is a sequential problem-solving process. After Discipline 4, where the root cause of the problem is identified and verified, the team proceeds to Discipline 5. The primary purpose of Discipline 5 is to brainstorm, evaluate, and select the most effective permanent corrective action(s) to eliminate the identified root cause. This step focuses on choosing the optimal solution before it is implemented, ensuring it will be effective and will not introduce new problems. The implementation itself occurs in the subsequent discipline, D6.

A. Discipline 5 – Implement a Work-around: Implementing a work-around or interim containment action is the purpose of Discipline 3, not Discipline 5.

B. Discipline 5 – Implement Corrective Actions: The implementation of the permanent corrective actions is performed in Discipline 6, after they have been chosen and verified in Discipline 5.

D. Discipline 5 – Prevent Recurrences: Preventing the problem from recurring is the objective of Discipline 7, which involves standardizing the changes and updating systems and procedures.

1. Avaya Professional Services. (2009). Avaya Tier 3+ Problem and Incident Management Process Description (Document ID: PIMProcessR3.0Issue1.0). Section 4.6, "D5: Choose and Verify Corrective Action," p. 14. This official document states, "The purpose of this step is to select the best permanent corrective action to remove the root cause and to verify that the decision will be successful."

2. University of Washington, Department of Mechanical Engineering. (n.d.). ME 495: Introduction to Mechanical Design - 8D Problem Solving. Lecture Slides. Slide 11, "The 8 Disciplines," lists the step following D4 (Determine Root Cause) as "D5: Develop/Choose Permanent Corrective Action(s) (PCA)."