User: The individual utilizing the project management application.
Project Manager: Oversees the planning, execution, and closing of projects.
Team Member: Collaborates on tasks within the projects.
Administrator: Manages user access, permissions, and overall system settings.

Functions:
1. User:
Creates new projects and assigns team members.
Sets project goals, objectives, and timelines.
Creates tasks within projects and assigns them to team members.
Monitors the progress of tasks and projects through the application dashboard.
Receives notifications for upcoming deadlines or task updates.
Communicates with team members through built-in messaging features.
Provides feedback and updates on task completion.

2. Project Manager:
Reviews project proposals and determines feasibility.
Establishes project timelines, milestones, and deliverables.
Allocates resources and assigns tasks to team members based on their expertise and availability.
Monitors project progress, identifying any potential risks or delays.
Adjusts timelines and resource allocation as needed to keep projects on track.
Communicates with stakeholders to provide project updates and address concerns.
Provides guidance and support to team members to ensure successful project completion.

3. Team Member:
Accesses assigned tasks and project details within the application.
Collaborates with other team members to complete tasks on time.
Updates task status and provides progress reports.
Communicates with the project manager and other team members regarding task-related issues or dependencies.
Participates in meetings or discussions related to project progress or planning.
Seeks clarification or additional information when necessary to complete assigned tasks effectively.

4. Administrator:
Manages user accounts, permissions, and roles within the application.
Configures project templates and settings to align with organizational requirements.
Monitors system performance and troubleshoots any technical issues.
Conducts regular backups and ensures data security measures are in place.
Provides training and support to users on how to effectively use the application.
Implements updates or enhancements to improve the functionality and usability of the system.


Sample Scenario:

User, a project manager at a software development company, logs into the project management application to oversee the development of a new mobile app. User creates a new project, sets a timeline for completion, and assigns tasks to team members, including developers, designers, and testers.
Throughout the project lifecycle, User monitors the progress of tasks, communicates with team members to address any issues or delays, and adjusts timelines as needed to ensure project milestones are met. Team members regularly update task statuses, provide feedback, and collaborate on various aspects of the project.

The Project Manager reviews the project dashboard to track overall progress, identify any bottlenecks, and make strategic decisions to keep the project on schedule. They communicate with stakeholders to provide updates on project status and address any concerns or feedback.

The Administrator ensures that the project management application is running smoothly, troubleshoots any technical issues, and provides support to users as needed. They also conduct regular maintenance and updates to the system to ensure optimal performance and security.

Throughout the project lifecycle, the project management application facilitates efficient communication, collaboration, and task management, ultimately leading to the successful delivery of the mobile app within the specified timeline.