Info

TYPES:

PERT

NO. OF ESTIMATES:

LOGIC:

CAN USE DUMMIES

CAN USE DUMMIES

USES CONSTRAINTS [WHiCH MAY FUNCTION AS DUMMES)

Figure 12-25. Comparison of networks.

Figure 12-23A illustrates a finish-to-start constraint. In this figure, activity 2 can start no earlier than the completion of activity 1. Figure 12-23B illustrates a start-to-start constraint. Activity 2 cannot start prior to the start of activity 1. Figure 12-23C illustrates a finish-to-finish constraint. In this figure, activity 2 cannot finish until activity 1 finishes. Figure 12-23D illustrates a percent-complete constraint. In this figure, the last 20 percent of activity 2 cannot be started until 50 percent of activity 1 has been completed.

Figure 12-24 shows the typical information that appears in each of the activity boxes shown in Figure 12-23. The box identified as ''responsibility cost center" could also have been identified as the name, initials, or badge number of the person responsible for this activity.

Figure 12-25 shows the comparison of three of the different network techniques.

The time period between the early start or finish of one activity and the early start or finish of another activity in the sequential chain is called lag. Lag is most commonly used in conjunction with precedence networks. Figure 12-26 shows five different ways to identify lag on the constraints.

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