1. The original name of the PCB board 8D from the circuit board factory is “8 Disciplines,” indicating that eight individuals are familiar with the established steps for addressing PCB board issues. However, in practice, there are actually nine steps:

2. **D0: Symptom Emergency Response Measures**

**Purpose:** This step aims to determine whether the PCB board issue warrants an 8D approach. If the problem is minor or not suitable for 8D resolution—such as concerns related to pricing or costs—this step focuses on immediate response measures when issues arise.

**Key Points:** Identify the type, scale, category, and so forth of the PCB board problem. Unlike D3, which addresses ongoing issues, D0 is an immediate reaction to a problem.

3. **D1: Team Establishment**

**Purpose:** Form a team composed of members knowledgeable in PCB board technology and products. Team members should be able to allocate time, have the necessary permissions, and possess the technical skills required to resolve PCB issues and implement corrective actions. The team must include a guide and a leader.

**Key Points:** Team membership, understanding of PCB technology and products; clear objectives; division of responsibilities; established procedures; team dynamics.

4. **D2: Problem Description**

**Purpose:** Clearly define internal and external customer complaints related to PCB board issues using quantitative terms, detailing aspects such as what the issue is, its location, timing, severity, frequency, etc.

“What is wrong with the PCB board?”

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Let me know if you need any more assistance!

**Method:** Quality risk assessment, FMEA analysis

**Key points:** Gather and organize all PCB-related data to clarify the issue; the problem description should summarize critical data pertaining to the PCB issue; review existing data to identify the PCB problem and define its scope; break down the PCB issue into manageable components; clarify the problem, ensuring that the explanation aligns with the customer’s confirmed concerns regarding the PCB, noting the unknown risk level.

**D3:** Implement and verify interim measures

**Purpose:** To ensure PCB issues are contained from both internal and external customers prior to the implementation of permanent corrective actions. (Initially optional, this step is now essential.)

**Method:** FMEA, DOE, PPM

**Key points:** Assess emergency response measures; identify and select the most effective temporary containment strategies; make informed decisions; execute and document actions; verification (using DOE, PPM analysis, control charts, etc.).

**D4:** Determine and verify the root cause

**Purpose:** Employ statistical tools to compile all potential causes related to the PCB issues, differentiating between events or environments that contribute to the deviations highlighted in the PCB problem descriptions, ultimately identifying the root cause.

**Method:** FMEA, PPM, DOE, control charts, 5-why method

**Key points:** Analyze each potential cause on the list; determine if the cause can be eliminated; verification through control plans.

**D5:** Select and verify permanent corrective actions

**Purpose:** Test the corrective plan before PCB production, ensuring the chosen measures effectively address the customer’s concerns without negatively impacting other processes.

**Method:** FMEA

**Key points:** Reassess team composition; make decisions and select optimal measures; reevaluate temporary actions and adjust if necessary; verification; management commitment to implement permanent corrective measures; establish control plans.

**D6:** Implement permanent corrective actions

**Purpose:** Develop a comprehensive plan to enact permanent measures, define process control methods, and document these to ensure the root cause of the PCB issue is addressed. Monitor the long-term effects during production.

**Method:** Error prevention, statistical control

**Key points:** Review team members; execute permanent corrective actions while discontinuing temporary measures; utilize fault measurability to confirm issue resolution; update control plans and process documentation.

**D7:** Prevent recurrence

**Purpose:** Revise the existing management system, operational practices, and procedures to avert future occurrences of the PCB issue and similar problems.

**Key points:** Identify preventive measures; verify effectiveness; make decisions; redefine organization, personnel, equipment, environment, materials, and documentation requirements.

**D8:** Acknowledge team efforts

**Purpose:** Recognize the collective contributions of the team, summarizing and celebrating their work.

**Key points:** Selectively retain key documentation; review team activities to capture experiences; appreciate the group’s collaborative strength in resolving PCB issues and its impact; provide necessary material and moral rewards.

If the response report does not meet the specified requirements, it will be rejected.

**Other requirements:** As a quality department staff member, please respond to emails or reports using data, documentation, supporting visuals, and other quantifiable criteria, minimizing the use of adjectives like “basic,” “probably,” and “many.”

Timeliness of the abnormality is crucial: report response time (3 working days), short-term actions, long-term measures, and permanent solutions.

If testing and verification require more than 3 working days, please inform in advance, explain the challenges, and communicate the completion timeline and plan via email.