The two-tier board model, also known as the dualistic governance system, is one of the classic corporate governance structures, although it is less familiar in Anglo-Saxon contexts. In Portugal, it is expressly provided for in the Companies Code and is based on a clear institutional separation between executive management and supervisory oversight.

In an environment of heightened regulatory expectations, public scrutiny and strategic complexity, understanding this model is essential for Directors, shareholders and executive leaders operating within more sophisticated governance structures.

What a Two-Tier Board Is

A two-tier board is a governance model that formally separates management and supervisory functions into two distinct bodies. Unlike the one-tier (monistic) model, where executive and non-executive Directors sit on the same Board, the dualistic system allocates these responsibilities to separate organs, each with its own mandate.

Broadly speaking, the structure comprises:

• A body responsible for the day-to-day management of the company
• A body responsible for supervising that management and overseeing long-term strategic direction

The central objective is to reinforce independence of oversight, clarify responsibilities and reduce the risk of excessive concentration of power.

The Legal Framework in Portugal

In Portugal, the two-tier board model is expressly recognised in the Companies Code, which allows three governance models:

• The monistic model
• The dualistic model
• The Latin model (a reinforced monistic structure)

Under the Portuguese dualistic model, the structure consists of:

• An Executive Board of Directors (Conselho de Administração Executivo)
• A General and Supervisory Board (Conselho Geral e de Supervisão)

This model is particularly relevant for larger public companies, complex corporate groups or organisations with diversified shareholder structures, where a clear separation between management and oversight is viewed as a safeguard of institutional robustness.

The Role of the Executive Board

The Executive Board is responsible for the company’s day-to-day management. It is composed of executive Directors who lead operations, manage resources, oversee teams and implement the approved strategy.

This body holds representation powers, makes operational and financial decisions and is accountable for business performance. While it enjoys autonomy in execution, it operates within the strategic framework and limits defined by the supervisory body.

It is also responsible for providing regular and adequate information to the General and Supervisory Board, enabling informed and effective oversight.

The Role of the General and Supervisory Board

The General and Supervisory Board is responsible for overseeing management and safeguarding the interests of the company and its shareholders. It does not engage in day-to-day operations and is composed predominantly of non-executive members.

Its functions include:

• Supervising the activities of the Executive Board
• Assessing management performance and strategic implementation
• Monitoring risk, compliance and internal control systems
• Issuing opinions on material strategic decisions
• Appointing and removing executive Directors in accordance with the law
• Overseeing succession and executive remuneration processes

This body acts as the guarantor of accountability and independent oversight, reducing the risk of self-assessment or managerial capture of decision-making processes.

Interaction Between the Two Bodies

In the dualistic model, effectiveness depends less on formal structure and more on the quality of interaction between the two bodies. Communication must be regular, structured and transparent, without compromising independence of function.

The General and Supervisory Board does not replace management nor interfere in operational matters. The Executive Board does not operate without scrutiny or outside the strategic framework defined. When properly designed, the model promotes balance, clarity and institutional trust.

Why Some Organisations Adopt the Two-Tier Model

The adoption of a dualistic structure is often driven by strategic and institutional considerations.

First, it creates a clear separation of roles, reducing ambiguity between decision-making and oversight. This strengthens scrutiny and mitigates conflicts of interest.

Second, it helps counter groupthink by establishing a supervisory body structurally independent from management. In complex organisations, this institutional distance is frequently viewed as advantageous.

Third, it enables the inclusion of Directors with strong strategic, institutional or sectoral expertise within the supervisory body, without exposing them to operational responsibilities.

Finally, in certain contexts, the dualistic model signals governance maturity to investors, regulators and institutional stakeholders.

Why Other Organisations Do Not Adopt It

Despite its advantages, the two-tier model presents challenges. The existence of two formal bodies can add complexity and requires disciplined coordination. Without a culture of trust and clarity, there is a risk of duplicated discussions or delayed decision-making.

The structural separation between executive and non-executive bodies may also reduce the informality and fluid communication that some Boards value in monistic systems.

Moreover, it demands greater investment in preparation, reporting quality and coordination, commitments not all organisations are ready to assume.

Two-Tier Boards and Governance Maturity

In Portugal, the choice of governance model is not ideological but strategic. The two-tier structure tends to be more appropriate in organisations where scale, shareholder profile or regulatory context justify clearly institutionalised and independent oversight.

When well implemented, the dualistic model reinforces accountability, protects supervisory independence and supports balanced long-term decision-making. When poorly designed, it risks becoming an additional bureaucratic layer.

Ultimately, more important than the formal structure is the clarity of roles, the calibre of individuals involved and the manner in which fiduciary responsibilities are exercised in practice.