The project manager should have conducted a thorough assessment of the team members' competencies and skills in relation to the training content before enrolling them. This would involve analyzing the training material to ensure it aligns with the team members' current skills and the tasks they are expected to perform. By doing so, the project manager could have ensured the training was appropriate and beneficial for the team members, thereby preventing the situation where the training felt too difficult and misaligned with their tasks2.
:
PMBOK Guide - Seventh Edition, particularly chapters related to training and competency development1.
Project Management Institute's resources on project team development and training needs assessment2.