When a new deliverable is proposed, the project manager should evaluate its impact on the project's scope, time, cost, and quality. A cost-benefit analysis is a systematic approach to estimate the strengths and weaknesses of alternatives and is used to determine options that provide the best approach to achieve benefits while preserving savings12. It involves comparing the expected costs of project actions to the expected benefits in order to choose the best option3.
References:
Project Management Institute. (2021). A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Sixth Edition.
ProjectManager.com. (2023). Cost-Benefit Analysis: A Quick Guide with Examples and Templates1.
Wrike.com. (2023). Cost-Benefit Analysis in Project Management Explained2.
Project-management.com. (2023). Cost Benefit Analysis - Formula, Example & Definition3.

Explanation:

The first step in addressing an underperforming team member is to understand the root cause of the underperformance. This can be achieved by having a private discussion with the team member to understand their perspective and challenges. This approach promotes open communication and trust, and it allows the project manager to work collaboratively with the team member to find a solution. The other options may not address the root cause of the problem and could potentially lead to further issues down the line. References:
PMBOK Guide, 6th Edition, Section 9.5.2.1: Team Performance Assessments

The most proactive and effective response is to leverage virtual teams. PMI recognizes virtual and distributed teams as standard practice in today's environment, especially when in-person meetings aren't possible. Tools for collaboration, file sharing, and real-time communication can ensure productivity and engagement across diverse geographic locations.
According to the PMBOK Guide - Seventh Edition and Agile Practice Guide, leveraging technology to support remote collaboration is part of tailoring project environments.
Option A focuses on risk tracking rather than an immediate solution.
Option C is drastic and costly.
Option D unnecessarily delays deliverables instead of adapting.
References:
PMBOK Guide - Seventh Edition, Team Performance and Tailoring Domains
Agile Practice Guide, Chapter 4 - Working with Distributed Teams
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The PMBOK Guide emphasizes the importance of iterative and incremental delivery in project management, especially for projects that need to be deployed quickly. This approach allows for early feedback from the customer, which can be used to make necessary adjustments and ensure that the solution meets the customer's needs. It also helps to manage risks and uncertainties associated with the project. References: PMBOK Guide,
6th Edition, Chapter 6: Project Schedule Management, Section 6.5: Develop Schedule