Info

Days

Figure 8-21: Gantt project chart from Figure 8-15.

listed in the action plan or whatever source document was originally used. As Figure 8-21 shows, activity times are superimposed on a linear calendar, much as in Figure 8-20. Precedence relationships are preserved by not allowing the activity line or bar for a successor activity to begin until its predecessors are complete. Scheduled activity times are drawn as light lines or hollow bars. A heavy line or a filled-in bar indicates actual progress. Color is sometimes used for easy visibility. The PM's ability to customize Gantt charts is limited only by the PM's imagination and the software being used.

Figure 8-21 transforms the modified PERT/CPM network into a Gantt chart. Note that three milestones are shown as diamonds below the baseline. These are the events that occur along the critical path. While there is no particular rule mandating the use of critical path events as project milestones, it is common for them to be chosen in this way. (If there are many critical events, some may be ignored and only the particularly noteworthy critical events are selected as milestones.) We can also see that while all precedence relationships must be preserved, it is not possible to distinguish easily their technical relationships simply by observing the chart itself. For example, activities a and b both have a duration of 20 days. Activities d, e, f, and g begin on the twentieth day. Using the Gantt chart, however, it is not possible to determine which, a or b, is predecessor to which of d, e, f, or g. if a single activity is completed at some time, it is reasonable to assume that other activities starting at that point are dependent on the first one; but if two or more activities end at the same time, the relationships between them and subsequent activities are unclear. Gantt charts, therefore, are generally inadequate for showing technological dependencies.*

'Actually, precedence relationships can be shown on Gantt charts, but the charts become cluttered and very difficult to read.

Legend

Í Scheduled Start 3 Scheduled Finish

— Actual Progress

Legend

Í Scheduled Start 3 Scheduled Finish

— Actual Progress

V i t y

Unavailable A Current Date

♦ Milestone Scheduled

♦ Milestone Achieved

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Project Management Made Easy

Project Management Made Easy

What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.

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