Understanding the WBS

The WBS breaks all the work in the project into separate tasks (tasks may also be referred to as activities). There are two kinds of tasks on a WBS: summary tasks and work packages.

"Install the sprinkler system" for a lawn is a summary task, because it includes several subordinate tasks. Installing a sprinkler system might include several of these distinct, subordinate tasks, such as digging trenches or installing pipes. Each of these separate tasks is called a work package. By performing all these simple work packages, you accomplish a summary task (see Figure 6.3).

Note that a summary task is not actually executed; it is, rather, a summarization of the subordinate work packages. The work packages are the ones that are actually executed. Understanding the relationship between summary tasks and work packages is fundamental to building a good WBS.

FIGURE 6.1 Detailed planning model.

Materials cost Develop budget ( from product specifications

CHAPTER 8

PROJECT PLAN

• All project tasks

• Schedule

• Responsibilities

• Budget

• Resource forecast

FIGURE 6.1 Detailed planning model.

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Home landscape project

1.0. Design home landscape -

2.1. Acquire lawn material -

2.2. Install sprinkler system

2.2.1. Identify sprinkler locations

2.2.2. Dig trenches

2.2.3. Install pipe and hardware

2.2.4. Cover sprinkler system

2.3.2. Prepare soil (fertilize, rake)

2.3.3. Plant lawn seed

3.1. Acquire fence material

3.2. Construct the fence -

3.2.1. Mark fence line and posts

3.2.2. Install posts

3.2.3. Install fencing and gates

3.2.4. Paint/stain fence

FIGURE 6.3 Work breakdown structure in outline form.

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