According to the Project Management Institute, when a team member's performance does not improve despite feedback sessions and escalation, it may be necessary to consider reassigning tasks or requesting a new resource. This is to ensure that project activities are not further hindered and project objectives are met. The PMBOK Guide emphasizes the importance of having the right human resources for the project's success and suggests that project managers should take corrective actions when a team member's performance is consistently below expectations12.
References:
* PMI's "Pulling up poor performers" article1.
* PMBOK Guide's principles on addressing poor performance and ensuring team effectiveness2.