Project Time Facts

Time can be a project constraint. Effective time management is the scheduling and sequencing of activities in the best order to ensure that the project completes successfully and in a reasonable amount of time. These are some key terms related to time management:

• Lag Waiting between activities.

• Lead Activities come closer together and even overlap.

• Free float The amount of time an activity can be delayed without delaying the next scheduled activity's start date.

• Total float The amount of time an activity can be delayed without delaying the project's finish date.

• Float Sometimes called slack—a perfectly acceptable synonym.

• Duration May be abbreviated as "du." For example, du=8d means the duration is eight days.

There are three types of dependencies between activities:

• Mandatory This hard logic requires a specific sequence between activities.

• Discretionary This soft logic prefers a sequence between activities.

• External Due to conditions outside of the project, such as those created by vendors, the sequence must happen in a given order.

There are three types of precedence between activities that you should know for the exam:

• Finish to Start The predecessor activity must finish before the successor activity can start.

• Finish to Finish The predecessor activity must finish before the successor activity can finish.

• Start to Start The predecessor activity must start before the successor activity can start.

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