What characteristic must be assigned to each task in the activity list?

Each task in the activity list must have a unique number assigned to it. This characteristic is crucial for effective tracking and management of activities throughout a project. By assigning a unique identifier, project teams can easily reference specific tasks, facilitate communication, and ensure clarity when discussing progress or addressing issues. This structured numbering system supports better organization, allowing team members to quickly locate information about each task without confusion.

While risk level, roles and responsibilities, and procurement needs are important aspects of project management, they are not universally required characteristics for each task in the activity list in the same way that a unique identifier is. The unique number is fundamental for keeping the activity list structured, especially in complex projects where numerous tasks may overlap or have dependencies.