Explain like I'm five · IT Mgmt

What is WBS (Work Breakdown Structure)?

WBS, told as a story about breaking overwhelming show prep down into a tree-shaped checklist of small tasks.

please get the tour readythe sponsor just asks for the show to be ready, and the planner has no idea where to starta big job looks overwhelming as one giant block

The sponsor just asks for the show to be ready, and the planner has no idea where to start.A big job looks overwhelming as one giant block.

SHOW PREPlighting? costumes? tickets?...all the tasks are jumbled togetherseeing show prep as one big lump, you can't tell what's missingonly breaking the work down small reveals what's missing

Seeing show prep as one big lump, you can't tell what's missing.Only breaking the work down small reveals what's missing.

WBS = a tree-shaped checklist that breaks a big job into small tasksSHOW PREPstage and lightssoundtickets and guestsgive each small task an owner and a duration, and the checklist becomes a real plan

WBS is a tree-shaped checklist that breaks a big job into small tasks.Give each small task an owner and a duration, and the checklist becomes a real plan.

Break down the big jobsplit the big job into smaller pieces
Assign an ownerdecide who owns each piece
Estimate durationestimate how long each task takes
Keep the 100% rulechild items cover all of the parent's work
BREAKDOWN LEVELSlevel 1 — whole tourlevel 2 — per show (per city)level 3 — stage, sound, tickets...the bottom level: work packageeach work package gets an owner and a duration

WBS splits the whole tour into each city's show, then into that show's tasks.Each work package gets an owner and a duration.

JUST RIGHTabout 20 itemsthe planner can manage it at a glanceTOO GRANULARhundreds of items...too many items to keep track ofsplit too fine, and tracking the items gets harderbreak work down enough to miss nothing, and stop while it's easy to handle

Split too fine, and tracking the items gets harder instead.Break work down enough to miss nothing, and stop while it's easy to handle.

In one breath

WBS = a tree-shaped checklist that breaks an overwhelming project down into small tasks — each with an owner and a duration, turning it into a real plan.

WBS (Work Breakdown Structure) is a hierarchical decomposition of project scope by deliverable or phase. It underlies schedule and budget planning. The 100% rule says child items must fully cover the parent's scope — but over-decomposing adds more management burden than it saves. This page covers breaking down project scope and carrying the result into schedule and budget.

When grown-ups say it

Work Package
The lowest level of the WBS. The unit that gets an owner and a duration. Scheduling splits it further into activities.
100% Rule
The rule that child items must fully cover the parent. Prevents anything from slipping through.
Decomposition Level
The levels from whole tour down to each task. Three to four levels is usually enough.
Schedule Management
Splitting work packages into activities and setting their order and duration. The next step built on top of the WBS.
Project Risk Mgmt
Preparing for surprises, like carrying an umbrella. Risk hides inside each WBS item. → the umbrella you carry even on a dry day
Negotiation & Contract
Tuning terms through the performance contract. WBS helps gauge scope before the contract. → tuning terms until both sign
IS Audit/PMO
Checks the project as a third party (audit) or supports its management (PMO). Audit checks that the contracted work was all carried out. The WBS is that work broken into a list. → the checker who watches the whole publishing run
Function Point
A ruler for measuring software size. If WBS breaks down the work, FP measures the size of the software. → the ruler that measures functions, not pages
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