The most common shortfalls in manpower assignment in project management include:

1. **Misalignment of Skills**: Assigning individuals to tasks that do not match their skills or expertise can lead to inefficiencies and subpar outcomes.

2. **Inadequate Resource Allocation**: Failing to allocate sufficient manpower to critical tasks can result in delays and increased pressure on team members.

3. **Failure to Monitor Workload**: Not regularly assessing the workload of team members can lead to burnout and decreased productivity among staff.

4. **Lack of Flexibility**: Rigidly sticking to an initial manpower plan without adjusting for changes in project scope or unexpected challenges can hinder progress.

5. **Poor Communication**: Inadequate communication regarding roles and responsibilities can create confusion and reduce accountability among team members.

6. **Neglecting Development and Training**: Not investing in training and development can limit the growth of the workforce and their ability to cope with evolving project demands.

7. **Ignoring Team Dynamics**: Failing to consider interpersonal relationships and team dynamics when assigning tasks can lead to conflicts and a lack of collaboration.

Addressing these shortfalls requires continuous assessment, clear communication, and a willingness to adapt to changing project needs.