2 Product description. The product description is discussed in Section 5.1.1.1. Prod-
uct characteristics often affect activity sequencing (e.g., the physical layout of a
plant to be constructed, subsystem interfaces on a software project). While these ef-
fects are often apparent in the activity list, the product description should generally
be reviewed to ensure accuracy.
.3 Mandatory dependencies. Mandatory dependencies are those which are inherent
in the nature of the work being done. They often involve physical limitations (on a
construction project it is impossible to erect the superstructure until after the foun-
dation has been built; on an electronics project, a prototype must be built before it
can be tested). Mandatory dependencies are also called hard logic.
.4 Discretionary dependencies. Discretionary dependencies are those which are de-
fined by the project management team. They should be used with care (and fully
documented) since they may limit later scheduling options. Discretionary depen-
dencies are usually defined based on knowledge of:
• “Best practices” within a particular application area.
• Some unusual aspect of the project where a specific sequence is desired even
though there are other acceptable sequences.
Discretionary dependencies may also be called preferred logic, preferential logic,
or soft logic.
.5 External dependencies. External dependencies are those that involve a relationship
between project activities and non-project activities. For example, the testing activ-
ity in a software project may be dependent on delivery of hardware from an exte
2 Product description. The product description is discussed in Section 5.1.1.1. Prod-
uct characteristics often affect activity sequencing (e.g., the physical layout of a
plant to be constructed, subsystem interfaces on a software project). While these ef-
fects are often apparent in the activity list, the product description should generally
be reviewed to ensure accuracy.
.3 Mandatory dependencies. Mandatory dependencies are those which are inherent
in the nature of the work being done. They often involve physical limitations (on a
construction project it is impossible to erect the superstructure until after the foun-
dation has been built; on an electronics project, a prototype must be built before it
can be tested). Mandatory dependencies are also called hard logic.
.4 Discretionary dependencies. Discretionary dependencies are those which are de-
fined by the project management team. They should be used with care (and fully
documented) since they may limit later scheduling options. Discretionary depen-
dencies are usually defined based on knowledge of:
• “Best practices” within a particular application area.
• Some unusual aspect of the project where a specific sequence is desired even
though there are other acceptable sequences.
Discretionary dependencies may also be called preferred logic, preferential logic,
or soft logic.
.5 External dependencies. External dependencies are those that involve a relationship
between project activities and non-project activities. For example, the testing activ-
ity in a software project may be dependent on delivery of hardware from an exte
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