When faced with a situation where a team member often disagrees with the project manager and refuses to implement decisions, it is crucial for the project manager to engage in conflict resolution by understanding the team member's perspective. This involves identifying the root causes of the disagreement and working collaboratively to find a solution that aligns with the project's goals while addressing the team member's concerns. This approach not only resolves the current conflict but also strengthens team cohesion and prevents future disagreements.
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PMBOKGuide - Seventh Edition1.
PMI Professional in Business Analysis (PMI-PBA) Reference Materials2.

When a key team member, such as the lead design programmer, leaves in the middle of a project, it's a risk that could have been foreseen and for which a contingency plan might have been created. The project manager should consult the risk response plan, which will have strategies or actions outlined for such eventualities. This is a proactive approach to manage the situation without disrupting the project's progress and ensures that the project manager is prepared to handle the loss of critical personnel effectively1.
: = The importance of having a risk response plan that includes strategies for potential personnel changes is emphasized in PMI's guidelines for risk management. This approach is supported by resources that describe risk response strategies for mitigation, avoidance, transfer, exploitation, enhancement, sharing, and acceptance, which are essential for ensuring positive project outcomes2. Additionally, the role of the change control board is typically to oversee proposed changes to the project plan, not to manage resource allocation or personnel changes3.

The project manager should have ensured that the project repository is up to date and contains all the relevant information and documentation related to the project deliverables, such as user stories, acceptance criteria, test cases, design specifications, etc. This way, the remaining team members can access the information they need to continue working on the deliverable, even if a senior team member leaves the organization. This practice is consistent with the agile principle of maintaining a single source of truth and ensuring transparency and collaboration among the team members12. References: 1: PMBOK Guide, 6th Edition, Chapter 4: Project Integration Management 2: Agile Practice Guide, Chapter 3: Life Cycle Selection

The project manager should have ensured that regulatory compliance, including import regulations for the specific machine model, was considered in the quality management plan. This would involve understanding and adhering to the legal and regulatory requirements that affect the project scope, deliverables, and processes. By integrating regulatory compliance into the quality management plan, the project manager could have anticipated and mitigated the risk of the machine being blocked by customs, thus avoiding delays and potential financial losses.
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Project Quality Management According to the PMBOK1
Machinery Regulation: An Essential Guide2
Project Scope Management according to the PMBOK3

According to the PMBOK Guide, pull communication is a type of communication that is used when the information is large, complex, or requires a high level of detail, and the recipients can access it at their own discretion. Examples of pull communication include websites, intranets, e-learning, databases, and knowledge repositories. By using pull communication, the project manager can reduce the amount of emails sent to the team and allow them to access the project-related information when they need it. This can also improve the efficiency and effectiveness of the communication process. References: PMBOK Guide, 7th edition, page
286; Business Acumen for the PMP Exam