Build hierarchical WBS with task decomposition, cost roll-up, and responsibility assignment in tree diagram format.
This tool builds a project's task hierarchy as an editable tree: you add phases, break each into work packages, and break those into leaf-level tasks, each optionally tagged with a cost and an owner. It assigns decimal WBS codes (1, 1.1, 1.2, 2, 2.1...) automatically as you nest items, and sums cost upward so every parent shows the total of its children. The most common surprise is entering a cost on a task that also has children - decompose fully before pricing, since the roll-up is built from leaf values, not whatever you type at a parent level.
A concrete input and expected output from the current implementation.
Input
Website Launch 1 Design 1.1 Wireframes - $800 1.2 Visual Design - $1200 2 Development 2.1 Frontend - $3000 2.2 Backend - $4000 3 Testing - $1500
Expected output
1 Design = $2,000 (1.1 $800 + 1.2 $1,200) 2 Development = $7,000 (2.1 $3,000 + 2.2 $4,000) 3 Testing = $1,500 Project total = $10,500
Each parent's cost is the sum of its own leaf children ($800+$1,200=$2,000 for Design; $3,000+$4,000=$7,000 for Development), and the project total is the sum of all top-level nodes: $2,000 + $7,000 + $1,500 = $10,500.
Every node you create gets a code based on its position: top-level items are 1, 2, 3; a child of item 2 becomes 2.1, 2.2, and so on for deeper levels. Codes update automatically when you add, delete, or drag-reorder items, so a task's number reflects its current position in the tree, not when it was created.
Cost and a responsible-party field are entered at the leaf (lowest) level of each branch. The tool sums leaf costs up through every ancestor to the project root, so a mid-level work package shows the combined cost of everything beneath it without you re-entering totals by hand as the tree changes.
Not confirmed - the responsibility field in this style of WBS builder is typically a single value per leaf task. If you need shared ownership, the common workaround is splitting the task into separate leaf items, one per owner, so each keeps its own cost and assignment.
No. This tool builds the task hierarchy with cost roll-up and responsibility assignment only - it does not assign start/end dates, sequence tasks, or compute a critical path. You would need a separate scheduling tool for that.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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