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6 - PROJECT TIME MANAGEMENT

Figure 6-21 shows schedule presentations for a sample project being executed, with the work in progress
reported through the data date, a point in time when the status of the project is recorded, which is sometimes
also called the as-of date or status date. For a simple project schedule model, Figure 6-21 reflects schedule
presentations in the forms of (1) a milestone schedule as a milestone chart, (2) a summary schedule as a bar
chart, and (3) a detailed schedule as a project schedule network diagram. Figure 6-21 also visually shows the
relationships among the three different levels of schedule presentation.

6.6.3.3 Schedule data

The schedule data for the project schedule model is the collection of information for describing and controlling
the schedule. The schedule data includes at least the schedule milestones, schedule activities, activity attributes,
and documentation of all identified assumptions and constraints. The amount of additional data varies by application
area. Information frequently supplied as supporting detail includes, but is not limited to:

• Resource requirements by time period, often in the form of a resource histogram;
• Alternative schedules, such as best-case or worst-case, not resource-leveled, or resource-leveled, with
or without imposed dates; and

• Scheduling of contingency reserves.

Schedule data could also include such items as resource histograms, cash-flow projections, and order and
delivery schedules.

6.6.3.4 Project calendars

A project calendar identifies working days and shifts that are available for scheduled activities. It distinguishes
time periods in days or parts of days that are available to complete scheduled activities from time periods that
are not available. A schedule model may require more than one project calendar to allow for different work
periods for some activities to calculate the project schedule. The project calendars may be updated.

6.6.3.5 Project Management Plan updates

Elements of the project management plan that may be updated include, but are not limited to:
• Schedule baseline (Section 6.6.3.1),

• Schedule management plan (Section 6.1.3.1).

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