CBS=WBS

1.040/1.401

Project ManagementSpring 2007 Planning

Dr. SangHyun Lee

Department of Civil and Environmental Engineering Massachusetts Institute of Technology

Project Management PhaseFEASIBILITY DESIGN PLANNING DEVELOPMENT CLOSEOUT OPERATIONS

Fin.&Eval. Risk

Organization Estimating Planning Planning

OutlinePlanning Hierarchical Project StructuresWork Breakdown Structure Organization Breakdown Structure Cost Breakdown Structure

Planning Components

What: Work Breakdown Structure How: Plans and Specifications Who: Organization Breakdown Structure How much: Cost Breakdown Structure (via estimate) When: Schedule

OutlinePlanning Hierarchical Project StructuresWork Breakdown Structure Organization Breakdown Structure Cost Breakdown Structure

Work Breakdown Structure

A WBS is a deliverable-oriented grouping of project components that organizes and defines the total scope of the projectWork not in the WBS is outside the scope of the project WBS is usually an operative tool used by contractors

First step towards constructing a schedule Central role in project monitoring and control

WBS: ExampleProjectSite-Work On-Site Utilities Buildings

different summary level

Level I Major Facilities

Grading and Drainage

Paving Surfaces

Water System

Underground Electrical

Office Building

Maintenance Building

Warehouse Building

Level II Sub-Facilities

Drives

Parking

Architectural

Structural

Mechanical

Electrical

Level III Work Item

Foundation

Shell

Level IV Tasks

Work PackageDenotes continued breakdown

Work Package

Work Package

Level V Work Packages

Illustrative Work Breakdown Structure (WBS)

Figure by MIT OCW.Source: Shtub et al., 1994

Work PackageLowest level Distinguish from Others Single Responsible Organization Assigned Start and Finish Assigned Budget Limited Duration

Types of WBSProject WBSOperative tool for monitoring and control contractor work

Contractual WBSDefines the level of reporting that the seller will provide the buyer May include less detail than Project WBS Agreed between owner and contractor

Functional Approachlevel 0 level 1 level 2 level 3 level 4COMPRESSOR 1 COMPRESSOR 2 FOUNDATIONS

GAS-STEAM COMBINED POWER PLANT

GAS

STEAM

INTERFACES

MAIN FUNCTIONS OF PLANT

TURBINE

GENERATOR

COMPRESSION STATION

ITEMS

COMPRESSORS

GAS TREATMENT

ENCLOSURE

UNITS

SUB-UNITS WORK PACKAGES

level 5DESIGN PROCUREMENT INSTALLATION

Physical Space ApproachProjectMain building1st floorStructures Plumbings Electrical HVAC

2nd floor

Service buildingStructures Plumbings Electrical HVAC

Procedure ApproachProjectFeasibility DesignBasic Detail Bid documents Shop drawings

Bid ConstructionFoundations subcontractMain building Piles Concrete foundations Service building Piles Concrete foundations

Steel erection Finishings

Commissioning

WBS: CSI Master Format - ExampleNORTHWEST CONSTRUCTION COMPANY 1242 First Avenue, Cascade, Washington 98202 (206) 239-1422 Work Breakdown Structure Huna Office Building 7/15/2000 CSI Description Division 1 Job Site General conditions 2 Site work: Earthwork & Utilities Paving Walks & Miscellaneous Sitework 3 Concrete: Purchase Reinforcement Steel Foundations Walls & Slabs 4 Masonry 5 Structural and Miscellaneous Metals 6 Wood & Plastic Rough Carpentry Finish Carpentry / Wood Floors 7 Thermal & Moisture Protection Insulation Roof & Accessories Gutters & Downspouts 8 Doors, Windows, Glass Doors Windows & Storefront Door Hardware CSI Description Division 9 Finishes: Drywall Painting Acoustical Ceilings Floor Covering: Carpet Floor Covering: Ceramic, Vinyl, Base 10 Specialties 11, 12, 13 Equipment, Furnishings, & Special Construction 14 Conveying Systems (Elevator) 15 Mechnical Systems: Plumbing Fire Protection HVAC Controls 16 Electrical Systems

SampleSource: Schaufelberger et al., 2002

OutlinePlanning Hierarchical Project StructuresWork Breakdown Structure Organization Breakdown Structure Cost Breakdown Structure

Organization Breakdown Structure

Decomposition of necessary resources to perform job Identification & organization of the resources responsible with carrying out activities associated with the project Used to keep track of specific work assignments & resource allocations

Organization Breakdown StructureProject resourcesProject management teamProject manager Construction superintendent Field superintendent Office manager Scheduler Accounter/controller Field engineer

Construction forceWorker SubcontractorElectrical Plumbing Insulation Tankage Roads

OBS/WBS Linkages

Linking the WBS and OBS.Project People

WBS

OBS

Major Facility

Major Group

Sub Facility

Sub Group or Department

Work Item

Discipline

Task 1

Task 2

Task 3

Engineer A

Engineer B

Engineer C

Work Package 1 Work Package 2 Work Package 3Denotes continued breakdown

Figure by MIT OCW.

Source: Shtub et al., 1994

OutlinePlanning Hierarchical Project StructuresWork Breakdown Structure Organization Breakdown Structure Cost Breakdown Structure

Cost Breakdown Structure (CBS)Breakdown of the costs of the various components of the structure including all work done by the subcontractors Serves as a basis for subsequent monthly pay requests by the contractor Used to continuously compare costs as they actually occur with the budget

Cost Breakdown Structure (CBS)100 101 102 103 104 105 115 116 117 121 240 .01 .05 .07 .08 .10 .11 .12 .16 .20 .40 .50 .51 .60 .90 MASTER LIST OF PROJECT COST ACCOUNTS Subaccounts of General Ledger Account 80.000 PROJECT EXPENSE Project Work Accounts .100 - .699 Clearing & Grubbing 245 Precast Concrete Demolition 260 Concrete forms Underpinning .01 footings Earth Excavation .05 grade beams Rock Excavation .07 slab on grade Backfill .08 beams Wood structural piles .10 slab Steel structural piles .11 columns Concrete structural piles .12 walls Steel sheet piling 280 Structural Steel Concrete poured 350 Masonry footings .01 8 in. block grade beams .02 12 in. block slab on grade .06 common brick bcarns .20 face brick slab on forms .60 glazed tile columns 400 Carpentry walls 440 Millwork stairs 500 Miscellaneous Metals expansion joints .01 metal door frames screeds .20 window sash float finish .50 toilet partitions trowel finish 560 Finish Hardware rubbing 620 Paving curing 680 Allowance 685 FencingSource: Shtub et al., 1994

Two Main Approaches

CBS = WBSCBS is the project cost control structure

CBS WBSCBS is the corporate multi-project cost control structure Usually the case of a firm that has an integrated cost control system

Diverse Combinations

WBS + OBS: Task assignments CBS + OBS: Budget monitoring of crews, etc. OBS + Schedule: Time-specific crew assignments CBS + Schedule: Cost monitoring