If the plan is unrealistic, it will often lead to a high slack value. When creating a project plan, it is important to take into account the limited resources and time available, as well as any potential risks and challenges that may arise. Figure 9-5: You can find slack time in tasks by using the Detail Gantt view and the Schedule table. Now you can see the Free Slack and Total Slack fields, as shown in Figure 9-5. Drag the divider bar to the right to view more of the table. Right-click the Select All button, and select Schedule from the list of tables.Ĥ. Slack appears as thin lines that extend from the regular Gantt bars.ģ. Tip You can identify slack on the Gantt bars. Select Detail Gantt from the list, and then click Apply. Choose ViewOMore Views to open the More Views dialog box.Ģ. To find tasks with slack time, follow these steps:ġ. To avoid creating slack time, use the As Soon As Possible constraint whenever possible. Task t^Je: Calendar: &BS code: Earned value methodįinish No Earler Than Finish No Later Than Must Frdsh On Must Start On Start Mo Earlier Than Start Mo Later Thaiįigure 9-4: Constraints can often create slack time. General | Predecessors | Resources Advanced j Motes | Custom Fields Name IDetermine budget Duration: [3d -rj r EstimatedĪs Soon As Possfcle Constant date: [|MA ^ When the dialog box appears, select the Advanced tab. To display the Task Information dialog box, double-click the task in your schedule. As you read in Chapter 4, you set constraints on the Advanced tab of the Task Information dialog box, as shown in Figure 9-4. For exam ple, you see a negative slack value when one task has a finish-to-start dependency with a second task, but the second task has a Must Start On constraint that is earlier than the end of the first task.Īlmost by definition, you create slack time if you use the Must Start On constraint when you create your task. Note Slack values can also help you identify inconsistencies in the schedule. Therefore, you can use tasks with slack to compensate for tasks that take longer than planned or to help resolve overassignment of resources. If you have slack in your schedule, you may be able to move tasks around to balance phases of the schedule that have no slack with phases that have too much slack. Most projects contain noncritical tasks with slack - these tasks can start late without affecting the schedule. Free slack is the amount of time that a task can be delayed without delaying another task. Remarks If a task has an actual start date and also a deadline set, the start slack will be 0 and the finish slack will be the difference between the tasks finish date and deadline date.Slack time is the amount of time that a task can slip before it affects another task's dates or the finish date of the project. You add the Start Slack and Finish Slack fields to the task sheet and analyze the durations. Project calculates the finish slack as follows:įinish Slack = Late Finish - Early Finishīest Uses Add the Start Slack and Finish Slack fields to any task view when you want to review how free slack was calculated.Įxample You are reviewing free slack in your schedule and want to see more details about how it was calculated. Likewise, the late finish field contains the latest date that a task can finish without delaying the finish of the project. The early finish is the earliest date that a task could possibly finish. How Calculated Finish slack is the duration that represents the difference between the late finish and early finish dates. The smaller of the finish slack and start slack amounts determines the amount of free slack available, that is, the amount of time a task can be delayed without affecting the start date of a successor task or the project finish date. You could just Sort or Group or Filter by Finish Slack (Project, Sort/Group By/Filter).ĭescription The Finish Slack field contains the duration between the Early Finish and Late Finish dates. It is not really necessary to use the Duration1 field if all it does is repeat the Finish Slack and roll up. It gets unnecessarily difficult to compare durations when you have days and weeks. You would be much better off sticking to consistent units for Duration, Days. Bryan, I am still scratching my head about this (the rollup on TF) but I can say something now.
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