Definitions and Overlap
A hierarchy chart is any diagram that shows ranked relationships between elements — parent nodes above, child nodes below, with lines showing the relationship. It is a structural concept, not a business concept. A file system directory tree is a hierarchy chart. A biological taxonomy is a hierarchy chart. A family tree is a hierarchy chart.
An org chart is a specific type of hierarchy chart applied to an organisation. It shows people (or roles), their titles, their departments, and who reports to whom. The hierarchy in an org chart represents formal authority and accountability — not just abstract ranking.
Key distinction
All org charts are hierarchy charts. Not all hierarchy charts are org charts. When someone says “hierarchy chart” in a business context, they almost always mean an org chart. But the terminology matters when you are choosing which tool to use — org chart software is purpose-built for people data, while generic hierarchy chart tools handle any tree structure.
When to Use Each
Use an org chart when
- — You need to show who reports to whom
- — You are documenting a team for onboarding, board packs, or investor decks
- — You are planning a restructure or acquisition integration
- — A recruiter or exec search firm needs to map a client's leadership team
- — You are trying to identify gaps in management coverage
Use a hierarchy chart when
- — You are mapping a decision tree or process flow
- — You are showing a product taxonomy or category structure
- — You are documenting a system architecture with parent-child components
- — The relationships are conceptual rather than about real people
- — You need a generic tree diagram without people-specific fields
Functional vs Divisional vs Matrix Structures
Within org charts specifically, there are three dominant structural models. Most real companies sit somewhere between them — but understanding the pure forms helps you read any chart you encounter.
Functional structure
Organised by function: Engineering, Sales, Marketing, Finance, HR. Everyone in each function reports up to a functional head (CTO, VP Sales, CMO, CFO, CHRO). Clear lines of authority, deep functional expertise, but slow cross-functional collaboration. Most common in mid-market companies.
Divisional structure
Organised by business unit, product line, or geography. Each division has its own functional resources — its own marketing, its own finance, its own engineering. More autonomous, faster decision-making within each division, but duplication of resources across the organisation. Common in large enterprises and conglomerates.
Matrix structure
Combines functional and divisional lines. An engineer might report to the VP Engineering (functional) and also to the Product Lead for their product line (divisional). Two reporting lines, dotted-line relationships, more ambiguity — but better cross-functional coordination. Common in consulting, agency, and tech organisations at scale.
How an Org Chart Changes With Scale
The same company will need a fundamentally different org chart at five people, fifty people, and five hundred people. The structure that enables speed at ten people creates chaos at a hundred.
5 people
Flat star. Everyone reports to the founder. No departments. Responsibility matrix more useful than an org chart.
50 people
Functional hierarchy with a VP layer. Three to five departments, each with a head. CEO has 4–6 direct reports. Middle management emerging.
500 people
Divisional or matrix. Multiple VP layers, directors between VPs and managers. Geographic or product-line splits. Dotted lines for cross-functional roles.
The inflection points — roughly 15, 50, and 150 people — are when structural problems become organisational crises if you have not updated the chart. At 150 (sometimes called the “Dunbar number” for organisations), informal coordination breaks down entirely. Formal structure is not optional beyond this point.
Other Chart Types: RACI, Swimlane, Reporting Structure Map
Org charts and hierarchy charts are not the only tools in the organisational design toolkit. Here are the adjacent chart types and when to reach for them instead.
Clarifying who is Responsible, Accountable, Consulted, and Informed on a specific process or decision. Use this when the org chart exists but accountability for specific workflows is still ambiguous.
Showing how a process moves across different teams or departments. Each "lane" represents a team. Use this for cross-functional processes like hiring, onboarding, or product launches where handoffs between departments matter.
A simplified version of an org chart that only shows senior leadership — useful for board presentations, investor decks, and communications where you want to show the exec team without displaying every employee.
Shows informal relationships, communication patterns, and actual influence — the things an org chart deliberately does not capture. Used in change management and organisational consulting to understand how decisions really get made.
Frequently Asked Questions
What is the difference between an org chart and a hierarchy chart?
An org chart is a specific type of hierarchy chart that shows the reporting structure of an organisation — who manages whom, which department someone belongs to, and how authority flows from top to bottom. A hierarchy chart is a broader term that can refer to any diagram showing ranked relationships, including decision trees, classification systems, and file system structures. All org charts are hierarchy charts, but not all hierarchy charts are org charts.
What are the main types of organisational charts?
The four main types are: (1) Hierarchical — a traditional top-down reporting structure with a single chain of command; (2) Matrix — dual reporting lines where employees have both a functional manager and a project or business unit manager; (3) Flat — few management layers, common in early-stage startups; and (4) Divisional — structured around business units, product lines, or geographies rather than functions. Most real companies use a hybrid of these.
When should I use a RACI chart instead of an org chart?
Use a RACI chart when you need to clarify decision-making roles on a specific process, project, or workflow — not to show the reporting structure. RACI (Responsible, Accountable, Consulted, Informed) maps who does what on a task level. It complements an org chart but does not replace it. For example, an org chart shows that a VP of Marketing manages the content team; a RACI shows who approves content before it goes live.
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Related guides
How to Read an Org Chart: Lines, Boxes, and What They Mean
Solid vs dotted lines, span of control, and common misconceptions.
Startup Org Charts: How to Structure Your Team from 5 to 50 People
The three growth stages and how reporting structure should evolve at each.
How to Create an Org Chart from Excel or CSV (Step-by-Step)
The required columns, common mistakes, and the AI-assisted approach.