兑而成,具有酱香突出、甘润爽口、回.ppt

1、11/1/2020 4:39 AM,P2 - 1,Session Outline,What is a WBS and where is it useful? What is successive decomposition? How is the WBS used on a program? How can I tell if I have a good WBS? Numbering notation. Examples. Common errors.,Outline,11/1/2020 4:39 AM,P2 - 2,Where is WBS Useful?,Rocket Science? B

2、rain Surgery? CVISN?,11/1/2020 4:39 AM,P2 - 3,The Work Breakdown Structure Is.,“Product-oriented hierarchy of goods and services.” Form: inverted tree; or indented list. Visualizing the entire project. Common framework for planning and control. Vehicle to divide work into tasks that are: Manageable

3、Independent Measurable Integratable Graphically displays entire project. Clear definition of all effort. “Top Assembly Drawing” of the project. “Product Breakdown Structure” or “Project Breakdown Structure” more apt name! Or perhaps “Work Buildup Structure”.,WBS Definition,11/1/2020 4:39 AM,P2 - 4,C

4、reate a WBS via RecursiveProduct-Oriented Decomposition,(Call This Level 1),WBS Construction,2000-01-26,11/1/2020 4:39 AM,P2 - 5,Example: Break Down 100% (1 of 2),100%,2000-01-26,11/1/2020 4:39 AM,P2 - 6,Example: Break Down 100% (2 of 2),100%,2000-01-26,11/1/2020 4:39 AM,P2 - 7,By decomposing, event

5、ually.,.you get to activities that can be assigned and scheduled.,WBS Construction,11/1/2020 4:39 AM,P2 - 8,Example Extended WBS for a Complex Program,Note the different orientations from top to bottom.,WBS unfolds and evolves as scope and design become known.,WBS Definition,11/1/2020 4:39 AM,P2 - 9

6、,WBS for Brain Surgery (tree format),Illustrative,Sources: 1. Bailey units are stand-alone testable. Eliminating one product element will delete the associated costs. Segregate recurring from non-recurring costs. Identifies and defines all effort to be expended: correlation of lower levels to specif

7、ication tree, contract line items, data items, and work statement tasks. Useful! Reflects the way the work is managed and performed. Sufficiently low level to establish adequate visibility and confidence for cost estimating, project planning, and project control. Technical/cost/schedule can be integ

8、rated at every level for each element.,WBS Definition,11/1/2020 4:39 AM,P2 - 13,WBS Levels & Numbering Notation,Satellite Mission Project 1. Project Management 2. Science Instruments 2.1 Magnetometer 2.2 Spectrograph 3. Spacecraft Bus 3.1 Propulsion Subsystem 3.2 Attitude Control Subsystem 3.3 Comma

9、nd & Data Handling Subsystem 3.3.1 C&DH Hardware Processor Card Memory Card 3.3.2 C&DH Software 3.3.3 Subsystem Integration 4. Ground Support Equipment,WBS Definition,11/1/2020 4:39 AM,P2 - 14,Exercise,Scenario Exercise,Imagine you are working at the Atlantic Pacific Sea Vision Fount

10、ain Pen Manufacturing Company,Motto: “Yesterdays Technology Solving Todays Problems Tomorrow”,11/1/2020 4:39 AM,P2 - 15,Key Concept: The WBS is a product-oriented, hierarchical list of the work to be done. The program plan is linked to the system design through the upper levels of the WBS.,Work Brea

11、kdown Structure,WBS Concept,11/1/2020 4:39 AM,P2 - 16,Where Does the Work Get Done?!,Satellite Mission Project 1. Project Management 2. Science Instruments 3. Spacecraft Bus 3.1 Propulsion Subsystem 3.2 Attitude Control Subsystem 3.3 Command & Data Handling Subsystem 3.3.1 C&DH Hardware Proc

12、essor Card .1 Engineering Design .2 Layout & Package Design .3 Fabrication .4 Assembly & Test 3.3.2 C&DH Software Command Parsing Module .1 Architectural Design .2 Detailed Design .3 Coding .4 Unit Test 3.3.3 Subsystem Integration 3.3.3

13、.1 Integration Plan Integrate Instruments with Bus 4. Ground Support Equipment,WBS Definition,11/1/2020 4:39 AM,P2 - 17,Typical WBS for a State CVISN Program,WBS Sample,2001-06-14,Level 1,Level 2,Level 3,11/1/2020 4:39 AM,P2 - 18,Elements Not to Include in WBS,Do not use the structure of the

14、 contractors organization as the basis of a WBS. At the top levels do not begin by decomposing into the functions or cost categories associated with developing those products.,Adapted from Department of Defense Handbook Work Breakdown Structure, MIL-HDBK-881. Available at: /pm/n

15、ewpolicy/wbs/wbs.html. Includes examples from the defense industry.,Do not use generic names - use actual system names and nomenclature. No disembodied software - software developed to reside on specific equipment must be identified as a subset of that equipment.,WBS Definition,11/1/2020 4:39 AM,P2

16、- 19,Common Errors When Creating WBS,Does not include all of the work. Example: The project calls for a prototype and a final version, but the WBS shows only one of these. Or it shows the prototype in detail, and then simply lists the other without showing the work needed to produce it. The level of

17、 detail is not sufficient to manage the program. Example: The big pieces may be there, but they are not broken down sufficiently to enable the work to be assigned, tracked, and managed. (The test would be: Can you use this WBS to make a good, detailed CPM network?) Important but not readily apparent steps are