![]() ![]() ![]() So if the network logic says Manufacturing Phase II may commence on January 13 th, the SNET constraint will delay this activity until Monday, January 18 th. The SNET constraint in our demonstration says the Manufacturing Phase II effort cannot proceed until Monday, January 18 th. Whether it is the delivery of material, arrival of equipment, or availability of labor, the need for critical resources may justify the insertion of a SNET constraint in the schedule. Either reason would justify the insertion of a SNET constraint on Manufacturing Phase II.Īs you can see, resource availability can compel the project manager to divert from the schedule dependency/network logic and insert a constraint. Another possible issue is that a critical labor resource for Manufacturing Phase II is not available until Monday, January 18 th. However, we know that a critical component for Manufacturing Phase II will not arrive and be available until January 18 th, 2016. Phase II manufacturing is scheduled to start on January 13 th, 2016. The network logic says we can proceed with Manufacturing Phase II immediately after completion of Quality Assurance Phase I. Also, Manufacturing consists of two phases. Note that all activities are on the critical path. ![]() After parts are manufactured they are shipped to site and installed. Here we have a manufacturing and installation project. We begin with a demonstration schedule, Figure 1. This article describes how to insert a SNET activity constraint in Microsoft 2013, and when a SNET activity constraint is beneficial to the project schedule definition. Despite the paradox of using a SNET Constraint to restrain a task when the goal is to complete the project in as little time as possible, there are instances when this constraint type provides a proper and helpful enhancement to the schedule description. Hence the reason scheduling guidelines advise you to limit the number of activity constraints in the schedule. If so, then you will have to manually change the constraint date and/or type. Also you will have to examine each activity constraint individually to see if schedule updates are cause for making any changes to your constraint definition. If, however, you have activity constraints in the schedule be forewarned that they will not automatically update according to your updated task durations and/or dependency relationships. If your schedule has only task durations and dependency relationships defining the start and finish of tasks than updating your schedule will go rather nicely. The ideal is for your task durations and associated relationships to drive the schedule. Scheduling guidelines recommend using activity constraints sparingly. If the goal is to complete the project in as little time as possible, the question is why would a scheduler want to use a “Start No Earlier Than” (SNET) constraint on a project task? Let’s explore this paradox.Ĭonstraints describe external dependencies on the project schedule or tasks along the project schedule. ![]()
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