A resource is any quantifiable item in limited supply and of sufficient value to justify tracking and assigning to specific activities for a project. Resources include general or specialized labor, non-labor items such as equipment, and material items such as bricks.
Resources perform roles, if defined. Resources are indirectly assigned to activities by first planning the role required. It is also possible to directly assign resources to activities. For example, Chris, a level 2 contractor with the confirmed skills and status, is directly assigned to activity 01. However, a technician level 4 role is assigned to activity 02. The project will proceed while management determines the best available resource to fulfill this role.