The collection of information for describing and controlling the schedule is called the schedule data.  It includes at least the schedule milestones, schedule activities, activity attributes, and documentation of all identifies assumptions and constraints. In project management, schedule data could also include items such as histograms, cash-flow projections, and order and delivery schedules.

In the project management, the schedule data will be reviewed and updated in the control schedule process. It is updated and compiled into schedule model to reflect actual progress of the project and remaining work to be completed. The scheduling tool and the supporting schedule data are used in conjunction with manual methods or other project management software to perform schedule network analysis to generate an updated project schedule.

The updated project schedule will be generated from the schedule model populated with updated schedule data to reflect the schedule change and manage the project. On the other hand, the resource breakdown structure is a hierarchical representation of resources by the category and type.

Examples of resource categories include labor, material, equipment, and supplies. Resource types may include the skill level, grade level, or other information as appropriate to the project. The resource breakdown structure is useful for organizing and reporting project schedule data with resource utilization information.