What is work breakdown structure (WBS)?
According to PMI, a WBS is a hierarchical decomposition of the total scope of work to be carried out by the project team to accomplish project objectives and create the required deliverables.
A bit more simply, work breakdown structure, or WBS, is a system of organization for project management and project planning. It’s a specific method of breaking down large or complicated goals into manageable project objectives to create a manageable project plan.
WBS is for project managers that want to plan, schedule, and budget for each component of their project in a way that is complete but not overly detailed, easy to track and follow for the duration of the project, and makes it simple to communicate their progress and needs.
What’s an example of a work breakdown structure?
Project managers in just about any field can use WBS to reach their goals, but for the purpose of this article, let’s use a universal example, moving.
There are a lot of different types of tasks that go into a successful move, and at the end of it, you have to be entirely out of one place and completely settled in the next one. Writing the tasks involved in moving from one rental to another, the list is long and overwhelming like this:
- Shop for a new place to live
- Submit an application and fee
- Pay a deposit
- Sign a lease
- Notify your landlord you will be moving out
- Throw a going away party
- Transfer your renters’ insurance
- Turn on the utilities in the new home
- Turn off the utilities in the current home
- Change your mailing address and forward your mail
- Secure a mode of transportation to move your belongings
- Pack everything, breakdown furniture
- Hire a removal company to organize and secure the moving process
- Coerce your friends to help you move all of your belongings into a moving truck
- Repair walls, paint and clean
- Turn in your old keys
- Pick up the new keys
- Move everything inside the new home
- Unpack
You may be thinking, “Wait, there’s more!” or maybe, “Some of those tasks have multiple parts” and you are correct. This checklist is long, unorganized, and doesn’t cover everything that needs to happen—not even close. Writing each and every task in a checklist is a solid way to make sure everything gets done. However, a list alone won’t account for dependencies between tasks, how much work and resources each task needs, and consequently doesn’t give a clear picture of the totality of the project.
A WBS is a way to solve these problems. One by one, we’ll go over the elements of successful WBS in project management. Or you can go ahead and try out our WBS Template.
WBS elements
Before getting into the technical components of a specific tool for managing work breakdown structure (WBS), it’s good to get familiar with it’s core elements:
- Hierarchy
- Deliverables over actions
- Visual organization
1. Hierarchy
Think back to the moving checklist. Some of these tasks depend on others, meaning, they can’t be completed until other tasks have been completed first. For example, you’ll probably load your furniture in the moving truck before you turn in the keys, therefore, turning in your keys is dependent on being out of the apartment.
These dependencies will begin to shape a hierarchy of tasks. However, dependencies are not the only factor that matters. Let’s say you were to write your moving checklist in order of dependencies. Loading the moving truck would come before turning in the keys, but when should you turn on the utilities in the new place? Would that come before or after turning in your keys? Or how about simultaneously?
First-level items are larger goals, and within each larger goal, the second level of dependent tasks are grouped. This hierarchy can go on as much as needed.
In the moving example, the first level of tasks might be:
- Secure a new apartment
- Transfer belongings
- Close out the old apartment
Under each of these first-level items, we can arrange their dependent tasks.
- Secure a new apartment
- Pay deposit
- Sign lease
- Turn in application and associated documents
- Turn on utilities
- Begin mail forward
- Call electric company
- Transfer belongings
- Close out old apartment
This is how you begin creating a WBS, but it’s not the end of WBS. There are still a few critical factors that make this system work.
2. Deliverables, not actions
If you are familiar with WBS, you may have noticed an error in the above hierarchy: each item was listed as a verb. It’s common to think of to-do lists as actions, “Do this” and “do that.” WBS is different. Rather than prescribing a method or process, a WBS is described in deliverables. Look at how this changes our list.
By listing deliverables instead of actions, you gain more flexibility in the process of how each task is done. In a traditional project management setting, this allows your team to be more agile and frees you from micromanaging. As the project manager, it is more important that the furniture is transferred than planning exactly how it is loaded in the truck. This means that the friends helping you move will be able to judge how best Tetris your belongings, while you have more time to manage the bigger picture.
3. Visual organization