Organisational Structure: Hierarchy, Span of Control and Delegation

Hierarchy, span of control and chain of command

An organisational structure is the way jobs, roles and authority are arranged in a business. It is often drawn as an organisation chart.

• Hierarchy: the levels of authority, from directors at the top to managers in the middle to workers at the bottom. Higher level = more authority.
• Chain of command: the line of authority from the top to the bottom. Instructions pass down it; reports and questions pass up it. Everyone knows who their line manager is.
• Span of control: the number of people who report directly to one manager.

Narrow vs wide span

• Narrow span (for example 3): close supervision, good for new or unskilled staff, but more managers are needed, so costs rise.
• Wide span (for example 10): staff have more freedom, fewer managers are paid, but each manager has less time per person. Works best with skilled, trusted staff.

Other roles

Authority is the right to make decisions. Responsibility is being accountable for a task. Line managers manage people directly; support staff give expert help (such as HR or IT) to other departments.

Delegation

Delegation means a manager gives a task, and the authority to complete it, to someone lower in the hierarchy. The manager stays responsible for the result.

Benefits

• Frees managers' time for bigger decisions.
• Staff learn new skills and feel trusted, which motivates them.
• Decisions can be quicker because the person closest to the work decides.

Drawbacks

• Mistakes if the person is not trained.
• The manager may lose some control.
• Training takes time and money at first.

Delegation works best with wide spans of control, because managers with many staff cannot do everything themselves.

Tall and flat structures

Tall structure: many levels, narrow spans of control.

• + Close supervision, clear roles, many promotion steps.
• − Slow communication (messages pass through many people and can be changed on the way), more manager salaries, staff may feel far from the top.

Flat structure: few levels, wide spans of control.

• + Fast communication, fewer managers to pay, staff have more freedom and feel closer to decision makers.
• − Managers can be overloaded, fewer promotion chances, less close supervision.

Large firms tend to be taller; small firms and start-ups tend to be flat. Removing management levels to make a firm flatter is called delayering.

Worked sum: 64 workers. With span 4: 1 → 4 → 16 → 64, so 4 levels and 1 + 4 + 16 = 21 managers. With span 8: 1 → 8 → 64, so 3 levels and 9 managers. Wider span = flatter, 12 fewer managers.

Centralised and decentralised structures

Centralised: the important decisions are made at the top (head office) by a few senior managers.

• + Strong control, the same image and rules everywhere, quick decisions on big issues, experienced people decide.
• − Slow to react to local needs, branch staff feel less trusted and less motivated, top managers can be overloaded.

Decentralised: decision-making authority is passed down to branch, regional or department managers.

• + Local managers know local customers, decisions are faster on the ground, staff are more motivated.
• − Branches may act differently, harder to control, local managers may lack experience.

Many firms mix both: head office sets the brand and budget, branches choose local stock, staff rotas and promotions.

Communication flows

The structure decides how information moves:

• Downward (vertical): instructions and targets from managers to staff.
• Upward (vertical): reports, ideas and problems from staff to managers.
• Horizontal (lateral): between people at the same level, such as two department heads.

Why structure matters

• The more levels a message passes, the slower it is and the more it can be changed or lost.
• Flat structures → faster, clearer messages; tall structures → slower, but more checked.
• Too much information (overload) or unclear lines of authority cause mistakes.

Good communication helps staff understand their jobs, feel valued and work as a team.

Try it: draw your school's chart

Draw an organisation chart for your school: head, deputies, heads of subject, teachers. Count the levels and the span of control of the head. Is it tall or flat? Is it centralised (head decides most things) or decentralised? Then in the 3D free-play step set a span that matches and see how many levels you get.

Key formulas and definitions

• Hierarchy = levels of authority, top to bottom.
• Chain of command = the path of authority: orders go down, reports go up.
• Span of control = number of people reporting directly to one manager.
• Wider span → fewer levels → flatter structure.
• Delegation = passing a task + authority down; responsibility stays with the manager.
• Centralised = decisions at the top; decentralised = decisions spread to local managers.

Worked examples

Common mistakes

• Confusing chain of command (the line of authority) with span of control (how many people one manager directs).
• Thinking delegation passes on responsibility. It passes the task and authority; the manager is still accountable.
• Saying a flat structure has a narrow span. Flat = wide span; tall = narrow span.
• Thinking decentralised means no head office. Head office still exists; it just hands some decisions down.