Personal Finding System
2. Admin's operating
1.5 View task
1.2 Register
2.2 Approving tasks
1.6 Process task
2.6 Archiving
3.1 Login
3.4 Delete device
2.3 Publish tasks
2.4 Authorize user
1.4 Modify task
1.7 Change password
2.1 Login
3.3 Add device
3.2 Register
1.3 Create task
1.1 Login
1. User's operating
3. Device owner's operating
2.7 Change password
2.5 Manage user information
