Strategic Business Leader · Leadership and organisational culture

Leadership Theories and Styles for ACCA SBL

Updated 11 October 2026

Leadership theories explain what makes a leader effective. Trait theories look at personal qualities. Style theories look at behaviour. Contingency and situational theories say the best style depends on the circumstances. In SBL, you pick a model, apply it to the case facts, and recommend a style with reasons.

Understand Leadership Theories and Styles

Leadership is the ability to influence people to work towards a shared goal. Theories try to explain why some leaders succeed. They developed in stages, and each stage fixed a weakness of the one before.

Trait theories say leaders have certain personal qualities, such as drive, confidence and integrity. The weakness is that no list of traits reliably predicts success. Style theories moved the focus to what leaders do. Blake and Mouton's grid scores concern for people and concern for production on a scale of 1 to 9 each. Adair's action-centred leadership says a leader must balance three needs: the task, the team and the individual.

Contingency theories say no single style always works. Tannenbaum and Schmidt show a continuum from boss-centred (the leader tells) to subordinate-centred (the team decides). The right point depends on the leader, the followers and the situation. Fiedler says a leader's style is fairly fixed, so you should change the situation or change the leader. His least preferred co-worker (LPC) scale measures style. His situation has three factors: leader-member relations, task structure and position power.

Situational leadership from Hersey and Blanchard says the leader should adapt to the readiness (competence and commitment) of followers. Low readiness (R1) needs telling. Low-to-moderate readiness (R2) needs selling. Moderate-to-high readiness (R3) needs participating. High readiness (R4) needs delegating.

In SBL, you are not asked to recite theories. You are asked to advise. Use the model as a tool to diagnose the leader in the case, judge whether the style fits the situation, and recommend what should change.

Key rules to remember

Blake and Mouton grid positions: (1,1) impoverished | (9,1) authority-compliance (task) | (1,9) country club | (5,5) middle of the road | (9,9) team; Scores are (concern for production, concern for people), each from 1 to 9. (9,9) is presented as the ideal, but test whether it fits the case.
Adair's three circles: Task + Team + Individual needs; Effective leaders balance all three. Over-focus on one weakens the others.
Tannenbaum and Schmidt continuum: Tells → Sells → Suggests → Consults → Joins. Left end: boss-centred, the leader decides and announces. Right end: subordinate-centred, the leader joins the team and the team decides within limits set by the organisation.; This is a simplified five-stage version of the original model, which has seven points. Move right as followers are more capable and the leader trusts them more. Move left under time pressure or crisis.
Fiedler's contingency factors: Leader-member relations + Task structure + Position power; Task-oriented (low LPC) leaders tend to do best in very favourable or very unfavourable situations. Relationship-oriented (high LPC) leaders do best in between.
Hersey-Blanchard styles: Telling (S1) | Selling (S2) | Participating (S3) | Delegating (S4); Match to follower readiness: low, low-to-moderate, moderate-to-high, high.

How to solve Leadership Theories and Styles questions

Use this method for any SBL question on leadership style or theory.

1Read the requirement. Note whether you must assess, explain, compare or recommend.
2Identify the leader and the followers in the scenario, and note the situation (crisis, growth, change, routine).
3Choose one or two models that fit the facts. Use Adair or Blake and Mouton for behaviour, and Fiedler or Hersey-Blanchard for fit.
4Briefly state the model in one or two sentences. Do not write out the whole theory.
5Apply it. Quote specific facts from the case to place the leader on the model.
6Evaluate the fit. Say what works, what does not, and why it matters for the organisation.
7Recommend a specific action, such as changing style, training the leader or changing the situation.
8Conclude in one line. Show professional skills by being clear and practical.

Quickest way: Fact, model, fit, fix

When to use it: Use this when time is short and the question asks you to assess a leader's style.

Underline two or three facts about how the leader behaves.
Name one model and place the leader on it.
State whether this matches the situation and followers.
Give one clear recommendation.
Check you have used case facts in every paragraph.

Common mistakes in Leadership Theories and Styles

Writing out the theory with no link to the case.
Students memorise models and want to show their knowledge.
Fix: Spend one sentence on the model and the rest applying it to named people and facts.
Saying the (9,9) team style is always best.
The grid labels it as ideal.
Fix: Test it against the situation. In a crisis or with inexperienced staff, a more directive approach may fit better.
Confusing Fiedler with Hersey-Blanchard.
Both are contingency or situational models.
Fix: Remember that Fiedler treats style as fixed and changes the situation, while Hersey-Blanchard has the leader flex style to follower readiness.
Labelling the leader without evaluating.
Identifying a style feels like the answer.
Fix: Always add whether the style suits the context and what the consequences are.
Ignoring followers in the analysis.
Students focus on the leader's personality.
Fix: Comment on follower skills, motivation and readiness, because most models depend on them.
Giving a generic recommendation such as 'improve leadership'.
Students run out of time or ideas.
Fix: Recommend a specific action, such as moving from telling to coaching or giving the leader coaching in delegation.

Worked examples

Example 1

A founder-CEO of a growing manufacturer makes every decision personally, sets tight targets and rarely asks staff for views. Staff turnover is rising and talented managers are leaving. Using Blake and Mouton, assess the CEO's style and recommend a change.

Show the solution

The CEO sets tight targets and controls decisions, which shows a very high concern for production. Ignoring staff views and high turnover show a low concern for people.
This places the CEO near (9,1), the authority-compliance style.
This style can work for a small start-up needing speed. It fits poorly now, because the business is larger and relies on capable managers.
The consequences are visible in the case: demotivation, loss of talent and the risk of lost knowledge.
Recommend moving towards a higher concern for people, for example consulting managers on decisions, delegating operational matters and setting development plans.
The aim is a more balanced style closer to (9,9), while keeping a focus on results.

Answer: The CEO is near (9,1), authority-compliance. It no longer fits a larger firm and is driving out talented managers. The CEO should keep the focus on results but raise concern for people through consultation, delegation and development.

Example 2

A new project team of recent graduates has been given a complex client assignment. They are enthusiastic but lack experience. The manager has just started to delegate most decisions to them. Using Hersey-Blanchard, evaluate the manager's approach.

Show the solution

Assess follower readiness. The graduates are enthusiastic (high commitment) but lack experience (low competence). In the standard model this is R1: unable but willing.
R1 maps to S1, telling, which combines high directive behaviour with low supportive behaviour. The manager gives clear instructions and closely supervises.
The manager is delegating (S4), which suits followers with high competence and commitment.
The mismatch risks errors, missed deadlines and a poor client outcome. The team may also feel unsupported.
Recommend the manager give clear instructions, set roles and deadlines, and check progress closely now. As competence grows, move to selling (S2), then participating (S3) and delegating (S4).

Answer: The manager's delegating style is a poor fit for an inexperienced team. Hersey-Blanchard points to S1, telling, with high direction, now. The manager should then move through selling and participating to delegating as the team gains competence.

Exam tips

Do not list theories. Pick the one or two that fit the case facts best and apply them fully.
Link leadership style to the strategy, culture or change in the scenario to earn higher-level marks.
Use the professional skills marks. Be concise, structured and practical, and write for the audience named in the requirement.
If asked to compare leaders, use the same model for both so the comparison is clear.
Always finish with a recommendation, not only a diagnosis.

Practice questions from Leadership and organisational culture

Leadership Theories and Styles: frequently asked questions

Which leadership theories do I need for ACCA SBL?

Know trait, style, contingency and situational approaches. The key models are Adair, Blake and Mouton, Tannenbaum and Schmidt, Fiedler and Hersey-Blanchard. Also know transactional and transformational leadership. Focus on applying them to a case rather than reciting them.

What is the difference between transactional and transformational leadership?

Transactional leadership works through exchange: rewards for performance and sanctions for failure. Transformational leadership inspires followers with a vision so they go beyond self-interest. Transactional suits stable routine work, and transformational suits change.

How do I apply leadership theories in the SBL exam?

State the model briefly, then place the leader on it using specific facts from the case. Evaluate whether the style suits the situation and followers. End with a clear recommendation.

How is Fiedler different from Hersey-Blanchard?

Fiedler says a leader's style is largely fixed, so effectiveness depends on matching leader to situation. Hersey-Blanchard says the leader should change style according to followers' readiness.