Work Breakdown Structure: What It Is and How to Implement WBS with Quire

Last updated: October 30, 2026

Kanban, Scrum, GTD, waterfall. Project management methods multiply faster than anyone can learn them, and while you're comparing frameworks, the project sits there, too big to start.

What you need first is simpler than a methodology. You need a way to break the thing into pieces small enough to finish. That's exactly what the Work Breakdown Structure (WBS) is for.

No need to stress. We'll walk you through creating a WBS, setting up your project, and deciding what goes in it. By the end, your project will practically run itself. (Practically. You still have to do the tasks.)

What is the Work Breakdown Structure?

The idea is right there in the name. You start with a big goal and break it down into smaller, more manageable tasks. If a project feels too big to even begin, our 4 steps to break down an overwhelming project is the informal version of the same instinct a WBS formalizes.

The Project Management Institute (PMI) defines it in the PMBOK Guide as a "deliverable-oriented hierarchical decomposition of the work to be executed by the project team." Which is a long way of saying "break the big thing into small things, and keep the small things attached to the big thing."

Sound familiar? It's been Quire's approach from day one. We were one of the first project management tools to let you break a parent task into unlimited subtasks.

Project managers use a WBS to break down a complex scope, see dependencies, and give everyone a clear overview of the project. A long to-do list hides the shape of the work. A WBS shows it.

It's typically built during the planning phase, one of the five phases of the project life cycle, and it stays the reference document teams return to through execution. It's the same backbone you'd capture in a project plan template.

What Are the Two Types of Work Breakdown Structure?

There are two types of WBS, deliverable-based and phase-based. Deliverable-based is the more common one, and usually the better choice.

The whole difference lives in Level 1. What you put at the top of the hierarchy decides how everything underneath breaks down. Pick based on how clear your end goal is, not on which diagram looks nicer.

Type 1: Deliverable-Based Work Breakdown Structure

A deliverable-based WBS shows how the project's deliverables (products, services, or results) relate to the scope of work needed to produce them.

You take the big picture and break it into smaller deliverables that each support the main goal.

It's especially useful for shorter projects with clear outcomes, like producing your annual revenue report. You know what the finished thing looks like, so you can work backward from it.

There is one concept in WBS you should know, the 100% rule. The WBS should include 100% of the work required to complete the project, nothing more and nothing less.
Every task, deliverable, and sub-task should contribute directly to the project's objectives. That way nothing is left out, and no unnecessary work clutters up the plan.

Type 2: Phase-Based Work Breakdown Structure

In a phase-based WBS, you organize the project by the phases it moves through. Each phase has its own set of tasks, grouped into work packages, and you tackle them one stage at a time.

This suits long-term projects whose goal is a moving target, like boosting customer retention by 50% over the next three years. There's no single deliverable you can draw a box around, so you work through phases instead.

• Research: find out what is driving the number.
• Strategy development: decide which levers you'll pull.
• Implementation: ship the work.
• Ongoing adjustments: correct course as results come in.

Each phase carries its own tasks that build toward the goal, so you can adapt as you go and keep the project on track even when the target moves. That's the same flexibility that makes agility valuable in day-to-day project management.

Phases are easier to name once the underlying process is drawn out. Business process mapping shows which map type to draw first, so the phases you pick match how the work actually flows.

What are the Three Levels of Work Breakdown Structure?

Before you build a WBS, get a solid grasp of the project. Its objectives, its scope, and its requirements. You can't break down deliverables you haven't defined yet.

A WBS centers on what you need to deliver to reach the project's goals, and it breaks that into three levels.

1. Level 1: the project title or the final deliverable (think of this as the main goal or parent task).
2. Level 2: the major deliverables that support the final one.
3. Level 3: the specific tasks needed to complete each major deliverable.

What Task Hierarchy and Subtask Breakdown Does Quire Provide?

Quire builds task hierarchy in three native layers.

• Section: your Level 1 deliverable.
• Parent task: a Level 2 workstream sitting beneath it.
• Subtask: Level 3 work nested under each parent.

Nesting is unlimited, so a complex deliverable can go four or five levels deep without splitting into separate projects.

That matters because a WBS has no depth limit, and many popular tools do.

• Monday.com offers a single level of subitems.
• Asana and ClickUp cap how many levels of subtasks you can nest.

When your WBS needs to go deeper than the tool allows, the breakdown gets forced into workarounds. Quire's unlimited nesting means the tool never decides how granular your WBS can be.

That's the structural upgrade many growing teams need once a flat board stops scaling and a single list of cards can't hold the whole project anymore.

List view auto-numbers the hierarchy (1.1, 1.2), and the same breakdown stays intact when you switch to Board, Table, or Timeline view.

The deeper the hierarchy, the more it pays to be deliberate about managing dependencies between the tasks it creates, so a delay in one Level 3 task doesn't stall the Level 2 workstream above it without anyone noticing.

What Is the Work Breakdown Structure Dictionary?

A WBS diagram is all boxes and lines, with no room for detail. The WBS dictionary fills that gap. It gives every task the context the chart can't hold, so nobody has to ping you late in the day asking what "Deliverable 2.3" means.

Here are the key fields to include in your WBS dictionary.

• Task names: keep them short and clear, a few words each.
• Responsible organization or individual: the assignees, including contact info.
• Descriptions: a bit more detail, but stick to one or two sentences.
• Deliverables: be specific about what needs to be completed.
• Budget: projected expenses, including how much, for what, and by when.
• Milestones: the points on the timeline where major tasks are completed.
• Approvals: any tasks that require approval.
• Risks: known threats or opportunities, with response strategies.
• Additional information: references, related work details, and so on.

You can learn how to create Approvals and Custom Fields in Quire to better manage your projects.

You can include more fields than these. The goal is a resource where team members can easily find what they need to finish their tasks, not a form nobody fills in.

The Milestones row deserves more thought than a date in a cell. See how to choose project milestones that mark real decision points, and how many a 12-week project needs.

How to Use Quire to Set Up the Levels in Work Breakdown Structure

Don't want to build the hierarchy from scratch? Quire's template library ships a ready-made Work Breakdown Structure Project template with the phases and deliverable levels already laid out. Copy it into your workspace and swap in your own deliverables.

Approach 1: Use Quire Task List to Set Up WBS

Imagine you're building a house and have to break that goal into smaller tasks. Here are some deliverables you might set up.

There are different ways to organize and present a WBS, and the outline is the easiest and most popular. It shows the hierarchy of deliverables with indents and numbering. If your Level 2 deliverable is numbered 1, the Level 3 deliverables beneath it are 1.1, 1.2, 1.3, and so on.

In Quire, set up your Level 1 using Sections, then break it into Level 2 with parent tasks and Level 3 with as many subtasks as you need.

Approach 2: Use Quire Kanban Board to Set Up WBS Chart

The Kanban Board view turns the same hierarchy into columns and cards instead of an indented outline. Remember to toggle on the Task Bundle option and shuffle your board by section before you start.

Your columns are now grouped by the sections you used to define Level 1. Each section is a stage or a phase of the project, and with Task Bundle on, every subtask stays nested under its parent task, so the hierarchy survives the move to a board.

A Kanban Board helps you track progress against your WBS, adjust tasks when there's a bottleneck, talk with your team on a single canvas, and plan the roadmap for your project.

Note: The WBS chart in Quire is fully actionable, not just a way to visualize your tasks. Quire is the only project management software that offers this level of functionality.

Approach 3: Use Quire Table View to Manage WBS

A table is the third way to set up and manage a WBS. Quire's Table view shows every element of the WBS with all its details in one grid. The leftmost column lists the major deliverables, and the columns to the right break down the levels beneath them.

Switch from List view to Table view and add custom fields to carry the detail. In this table we included assignees, milestones, risks, costs, budget, and effort, using a few simple formulas.

Tips: Here's how to create Formulas and Custom Fields in Quire.

Budget and risk fields on a WBS are the kind a project manager wants to own. Lock them so the team reads the values and only admins or chosen members change them. See how to lock a Custom Field.

Approach 4: Use Quire Timeline to Track Your WBS Project

Quire Timeline lays the project out horizontally, so you can see at a glance how tasks depend on one another, track deadlines and progress, adjust the dates, and filter and sort tasks in whatever order matches your goal.

The WBS template is one of many: 20+ project management templates your team will actually use lists the rest, and helps you pick by the shape of the work.

New to laying work out on a horizontal track? See our guide to the project timeline for the four common types, six examples, and how to pick the right one.

Work Breakdown Structure is the Answer to Your Project Management

Creating a work breakdown structure is easier than it sounds. Once you get the hang of it, your team will love the clarity that comes with breaking a project down where everyone can see it. If WBS is your first step into structured planning, a project management course is a solid way to build on it.

Whether you're more of a visual or a verbal learner, the right work management tool makes the difference.

Quire was built around breaking work down. Nested tasks from day one, and the same breakdown readable as a list, a board, a table, or a timeline. If you want software designed with the WBS method in mind, start there.

Frequently Asked Questions

What is a work breakdown structure (WBS)?

A work breakdown structure is a deliverable-oriented hierarchical decomposition of the work a project team must execute. The definition comes straight from the Project Management Institute's PMBOK Guide. You start with one final deliverable and break it into progressively smaller, manageable pieces so nothing in the project scope gets missed.

What are the three levels of a work breakdown structure?

Level 1 is the project's final deliverable or title. Level 2 holds the major deliverables that support it. Level 3 lists the specific tasks needed to complete each Level 2 deliverable.

In Quire, you map these to Sections (Level 1), parent tasks (Level 2), and subtasks (Level 3), with unlimited nesting when a project needs to go deeper.

What is the 100% rule in a WBS?

The 100% rule states that a WBS must capture 100% of the work required to complete the project, nothing more and nothing less. Every deliverable and task should map directly to the project's objectives, which keeps scope creep out and stops busywork from cluttering the plan.

What's the difference between a deliverable-based and a phase-based WBS?

The two differ in what sits at Level 1. A deliverable-based WBS organizes the first level around concrete products, services, or results, and works best for shorter projects with clear outcomes.

A phase-based WBS organizes the first level around phases, research, strategy, implementation and so on, which fits longer projects whose end goal keeps evolving.

How do you build a work breakdown structure in Quire?

Create your Level 1 deliverable as a Quire Section, break it into Level 2 parent tasks, then add Level 3 subtasks under each. From there the same WBS reads four ways.

• List: the hierarchy, auto-numbered.
• Board: grouped by section with Task Bundle.
• Table: custom fields like budget and risk.
• Timeline: dependencies and deadlines.

Unlike a static diagram, Quire's WBS chart is fully actionable. Every node is a real task you can assign and track.

What is a WBS dictionary?

A WBS dictionary is a companion document that captures the detail a diagram can't. Task names, the responsible person, descriptions, deliverables, budget, milestones, approvals, and known risks. It gives your team one place to find everything they need to finish a task. In Quire, you can record these directly on tasks with Custom Fields.

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