Discretionary dependencies are sometimes referred to as preferred logic, preferential logic, or soft

? D iscretionary dependencies. Discretionary dependencies are sometimes referred to as preferred logic, preferential logic, or soft logic. Discretionary dependencies are establishedbased on knowledge of best practices within a particular application area or some unusual aspect of the project where a specific sequence is desired, even though there may be otheracceptable sequences.??.Discretionary dependencies should be fully documented since they can create arbitrary total float values and can limit later scheduling options. When fast trackingtechniques are employed, these discretionary dependencies should be reviewed and considered for modification or removal. The project team determines which dependencies are discretionaryduring the process of sequencing the activities. ? E xternal dependencies. External dependencies involve a relationship between project activities and non-project activities.??.Thesedependencies are usually outside the project team?s control. For example, the testing activity in a software project may be dependent on the delivery of hardware from an external source, orgovernmental environmental hearings may need to be held before site preparation can begin on a construction project. The project management team determines which dependencies areexternal during the process of sequencing the activities. ???. Internal dependencies. Internal dependencies involve a precedence relationship between project activities and are generallyinside the project team?s control. For example, if the team cannot test a machine until they assemble it, this is an internal mandatory dependency. The project management team determineswhich dependencies are internal during the process of sequencing the activities.6.3.2.3 Leads and LagsA lead is the amount of time whereby a successor activity can be advanced with respect to a predecessor activity. For example, on a project to construct a new office building, the landscapingcould be scheduled to start two weeks prior to the scheduled punch list completion. This would be shown as a finish-to-start with a two-week lead as shown in Figure 6-10. Lead is oftenrepresented as a negative value for lag in scheduling software.??.Complete Punch ListFS ? 2 Weeks (Lead)Write DraftSS ? 15 Days (Lag)Landscape Building LotEdit DraftFigure 6-10. Examples of Lead and Lag??.

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