Written by F.Pentney or Project Management, G. Brown College, Bus 1040 students. Spring and Fall 2002
W.B.S - Planning phase continued: dedicated page to
|WBS theory:||Layout||Task list||
|Defining work packages||Estimating work packages. Getting the budget approved||Assigning responsibilty of tasks -onto matrix||Scheduling the sequence of task. Pert and Gantt|
Camping Know this ! Qu. 31 handout Week 11.
Temporarily lost the dog!
|Renovate room||Dinner party||Making cup of tea||Shopping||
WBS. Work Breakdown Structure. This can be used for quick, short projects or large complex projects. What do we have to get done? Call this your project. This is your heading for the highest level or single box at the top of the WBS. Now, make a a list of all the things you can think of that need to be done related to your project. This is the task list. It doesn't matter in which order you write them down. You will sort them out afterward. i.e. . We look for relationships between the tasks and group them under headings called Summary tasks. These Summary tasks are completed only by doing all the work packages-the sub tasks.. Summary tasks become second level headings which break down the goal we wish to achieve into smaller pieces. In this next case it is a camping weekend. The task list items (some of which are activities) can be estimated and scheduled more easily and accurately if they are in related groups.
Here again are the steps in the procedure. This time we will use the Camping example from Week 11, Qu. 31
1. We use the hierchal or organizational format (WBS)
to show the related groups of tasks. We take the big picture item (camping
weekend) and decompose (break it down) into headings (summary tasks) and
then group the task items that can actually be done. (Work packages).
W.B.S. Work breakdown structure.
What is the project?
Done before scheduling.
making lists of all tasks/activities. # each activity (or give letter).
Can be chart form or outline
form See Verzuh, page 103 & 104
Can be chart form or outline form See Verzuh, page 103 & 104
W.B.S. Starts with summary headings.
Second level are the group headings.
Work packages e.g. third level
Team members help define the time and materials for each work package.
Remember to factor in all cost. Staff time, your time, hourly rates, benefits.
Resource costs. Equipment, materials, sundry items.
Add the cost of all the wok packages together and this will become your first estimate for this part of the WBS. or project.
Once the estimate is approved you it is used for the budget.
The budget helps plan the use of people and resources.
If people are over or underutilized we level off the resources-put
the them where they are needed or most used most efficiently-this is csalled
Use your handout to complete the WBS exercise.
this exercise to the budget stage.
What is it going to cost for your group to take the day off and go camping? Calculate cost of lost work hours only.
Note on these web pages the I am using tables to create
the diagrams for WBS and networks and they look similar in format. I suggest
you transpose these diagrams onto paper so you get practice and a sense
of what the finished product looks like. There is usually more than one
way of representing the tasks on the WBS. In this case I have decided
to put all the purchases as one trip to the store for one person rather
than each tradesperson buying their own items.
|# Items||List items||Find relationships.
Summary items first
|Define summary tasks-at level two|
|1||New floor tiles||Level one. Project goal.||8. Renovate
|2. 10. Purchases:cupboards
|Level two. Summary tasks.||2. Purchases||7. Labour||4. Paint|
|3||New cupboards||7. Labour:||Level 3
|10. Cupboards. tiles, fan||1. Install tiles||3.
| 5. Repair
|Repair plumbing||Install Tiles||Finish|
This diagram indicates that three of the tasks can be worked on at the same time. Note the scheduling is not dependent on resources. We don't have to have three people-we are just saying that the work could be done at the same time.
.Sample W.B.S. method: The task list for a Dinner Party.
The task list on the left can start in any
order but we will look for relationships that allow us to group the task
under similar headings or summary tasks.
Note top level task at top. Followed by summary
The lower row of #ís are the work packages
of what you would actually do as a task or activity. # 2, 10, 11, 6, 3,
4, 9, 1, 12.
Gantt chart. Note the asterisks are the milestone. They are also the summary task (second level)
If I have more than one person to buy
the groceries I could put the buy tasks under each other in the 15 minute
column. Same rule
Scheduling. Using the W.B.S./ task list above to create a schedule. This will be the schedule using the C.P.M. method.The summary tasks in this case are the critical path and time can be allocated for each package - which are all in the top row. Critical path is: 8 Buy groc., 5 Cook food., 13 Serve
WBS. Making a cup of tea.
||Teabag||Tea into cup||Stir|
Suggest you create your own line diagram for the chart below. This is
only a representation of the process.
Note: you only need enough detail to ensure understanding-relevant to persons completing the tasks.
|1||water in kettle|
|3||tea into pot||1. water in kettle||2. boil water||6. water into pot||7. brew tea||8. pour tea.||10. stir|
|4||milk into cup|
|5||warm pot||Start.||5. warm
|3. tea leaves into pot||connect 3 to 6.||Finish|
|6||hot water onto tea|
|7||brew tea||4. milk into cup||9. sugar into cup||connect 9. to 8.|
Shopping and the WBS.
Think of going to the supermarket. Shopping is your project. You make a list of all the things you need. Once the list is complete you group the items together under headings such as Meat, Vegetables, Frozen. These are you summary items. When you get to the departments you look at what is listed under these headings. Under meat you might have, Pork chops, Sausages. Under vegetables you might have: Broccoli, Turnips. Under Frozen you might have: Ice Cream, and Pizza. These purchase items are the same as the tasks items you could estimate on a WBS. If you were being paid to shop for someone you would add the time that it took to buy them times your hourly rate plus the cost of the item itself. This is the same as making up an estimate for the work packages on the WBS. Effort (# people/time, $ time value and resources $.)