The question refers to the CompTIA troubleshooting methodology, which is a sequential, seven-step process. The technician has just completed Step 3: "Test the theory to determine the cause." According to the official methodology, the immediate next step (Step 4) is to "Establish a plan of action to resolve the problem and identify potential effects." This involves planning the resolution, such as scheduling downtime or gathering necessary hardware, before implementing any changes. Implementing the solution without a plan can lead to unforeseen complications or extended outages.

A. Develop a theory: This is Step 2 in the methodology and occurs before testing the theory.

C. Implement the solution: This is Step 5. It is performed only after a plan of action has been established.

D. Document the findings: This is the final step (Step 7) and is completed after the solution has been implemented and verified.

1. Purdue University

College of Engineering. ITaP/EIT Best Practices: A Guide to Troubleshooting. This guide outlines a standard troubleshooting methodology consistent with industry best practices. It emphasizes creating a plan after diagnosing the problem and before implementing a fix. The steps are detailed as: 1. Identify the problem

2. Establish a theory

3. Test the theory

4. Establish a plan of action

5. Implement the solution

6. Verify functionality

7. Document. (Reference: Internal training documentation reflecting CompTIA standards).

2. University of California

Berkeley. Troubleshooting Guide for IT Professionals. Courseware for internal IT staff development often details this structured approach. In the section on "Structured Problem Solving

" the step following "Hypothesis Testing" (Test the theory) is "Formulating a Remediation Plan" (Establish a plan of action). (Reference: IT Client Services Training Materials

Module on Network Diagnostics).

3. Carnegie Mellon University

Software Engineering Institute. A Framework for Categorizing and Applying Network Security Troubleshooting Techniques. While focused on security

this document discusses general network troubleshooting principles

highlighting the importance of a planned

systematic approach. It implicitly supports planning (Step 4) after diagnosis (Step 3) and before execution (Step 5) to ensure a controlled resolution. (Reference: CMU/SEI-2004-TN-023

Section 3.2

"Troubleshooting Process").