The best approach in this situation is for the project manager to meet with the team members and the developer individually to understand the underlying issues and perspectives. This aligns with the conflict resolution strategies outlined in the PMBOK Guide, which emphasizes the importance of addressing conflicts proactively and collaboratively12. By meeting with the parties involved separately, the project manager can gather unbiased information, which is crucial for formulating an effective action plan. This approach also allows for a more personalized discussion, where each individual can express their concerns without the pressure of group dynamics. Once the project manager has a clear understanding of the conflict's root causes, they can work with the team to develop a resolution strategy that addresses the concerns of all parties and supports the project's goals.
: The PMBOK Guide and materials on conflict resolution techniques for project management professionals, as well as best practices for business analysts in managing conflicts123.

In situations where there is a collective disagreement rather than an outright conflict, it is often beneficial to allow the agile team to work through the issue on their own. This approach is supported by the principles of self-organization and empowerment that are central to agile methodologies. Allowing the team to handle the disagreement encourages collaboration and problem-solving within the team, fostering a sense of ownership and accountability for the outcomes. The project manager should monitor the situation and be ready to facilitate or intervene if the team is unable to resolve the issue and it escalates into a more significant conflict.
The answer is verified by the conflict resolution strategies outlined in the PMBOK Guide and the Professional in Business Analysis materials, which suggest that self-organizing teams should be empowered to resolve issues internally, with the project manager stepping in only when necessary12.

In the context of agile project management, when a team member is unavailable and it significantly impacts the deliverable, the project manager should perform an impact analysis to understand the extent of the impact on the project. The next step is to readjust the project schedule accordingly. This may involve re-estimating the remaining work, adjusting the scope, or re-prioritizing the backlog items. Once these adjustments are made, it is crucial to communicate the changes to the customer to set realistic expectations and maintain transparency. This approach aligns with the agile principle of responding to change over following a plan and ensures that the project continues to move forward in a controlled and informed manner. References: The answer and explanation are based on the principles found within the PMBOK Guide and the Agile Practice Guide, which are part of the reference materials for the PMP certification12. Additionally, the Professional in Business Analysis (PMI-PBA) reference materials support the importance of stakeholder engagement and communication, which are critical when there are significant changes in a project3.

In situations where a key customer stakeholder is adding new tasks and pressuring for quick results, it's important for the project manager to facilitate a collaborative approach. The project manager should encourage the customer to work directly with the product owner to prioritize requests. This ensures that the most important tasks are identified and addressed in a manner that aligns with the project's goals and capacity. It also helps in managing the customer's expectations by involving them in the decision-making process, which is a key aspect of stakeholder engagement in project management2. Additionally, this approach is in line with Agile principles, which emphasize customer collaboration over contract negotiation, suggesting that engaging customers in the development process is more beneficial than strictly adhering to contractual terms3. References:
* Manage Stakeholder Engagement | Project Management Professional (PMP)1.
* Planning effective stakeholder management strategies to do the same thing! - PMI2.
* Agile explained: The 4 Agile Manifesto values and 12 principles3.