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Task 1 is completed at the end of day 20 instead of day 10, Task 2 is completed at the end of day 25 instead of day 20, and Task 3 is still completed on day 30.

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l This example illustrates how multitasking can delay task completions. Multitasking also often involves wasted setup time, which increases total duration.

l 2.5 Schedule Development

l Critical chain scheduling assumes that resources do not multitask or at least minimize multitasking.

l Someone should not be assigned to two tasks simultaneously on the same project when critical chain scheduling is in effect.

l An essential concept to improving project finish dates with critical chain scheduling is to change the way people make task estimates.

l Many people add a safety or buffer, which is additional time to complete a task.

2.5 Schedule Development

l Critical chain scheduling removes buffers from individual tasks and instead creates a project buffer.

l In order to ensure that the critical activities are completed on time, buffers are used.

l A buffer is time that is included in the schedule to protect it against unanticipated delays and to allow early starts.

l Critical chain scheduling protects tasks on the critical chain from being delayed by using feeding buffers.

l 2.5 Schedule Development

l Project Buffer is additional time added before the project's due date.

l Feeding buffers are placed at each point where a noncritical activity is related to a critical path activity.

l Feeding buffers protect the critical activities from tasks that precede them and allow for early starts of critical.

l Feeding buffers are additional times added before tasks on the critical chain that are preceded by non-critical-path tasks.

2.5 Schedule Development

Figure provides an example of using critical chain scheduling.

Note that the critical chain accounts for a limited resource

the schedule includes feeding buffers and a project buffer.

The tasks marked with an X are part of the critical chain.

2.5 Schedule Development

Buffers are viewed as different than slack.

l slack is spare time.

l buffers are time blocks that are not expected to be used for work time (the same as slack),

l they are dedicated to cover most likely contingencies,

l if they are not needed, subsequent activities can proceed at the earliest time possible.

l Project buffers are used after the final task of a project to protect project completion time from delays (managing reserve).

3 Cost Planning

3.1 Cost Estimating Techniques

3.2 Cost Budgeting

3.1 Cost Estimating Techniques

Top-Down Estimates

Bottom-Up Estimates

Parametric Modeling

Problems with IT Cost Estimates

Sample Cost Estimate

3.1 Cost Estimating Techniques


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Читайте в этой же книге: Resource leveling | Defining a Work Breakdown Structure | Is a tabulation of activities to be included on a project schedule. The list should include | Is a network diagramming technique used to predict total project duration. | Staffing management plan | Quality assurance |
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Pauses or delays between activities are indicated in the network diagram.| Top-Down Estimates

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