Introduction
This essay explores the different types of constitutions in the context of constitutional law, focusing on their classification and the processes through which they are established. Constitutions serve as the foundational legal framework for governance, outlining the structure, powers, and duties of state institutions. Understanding the various forms of constitutions and their origins is essential for grasping how legal and political systems are shaped. This discussion will identify two primary classifications—written and unwritten constitutions, alongside rigid and flexible ones—before examining how each type is formed. The essay draws on established academic perspectives to provide a sound overview suitable for an undergraduate study of constitutional law in the UK.
Types of Constitutions
Written and Unwritten Constitutions
Constitutions can be broadly categorised as written or unwritten. A written constitution is a single, codified document that explicitly outlines the fundamental principles and rules of governance. The United States Constitution, drafted in 1787 and ratified in 1788, is a prominent example, serving as a clear, formal text that defines governmental powers and citizens’ rights (Barnett, 2016). In contrast, an unwritten constitution is not contained within a single document but is instead derived from a combination of statutes, common law, conventions, and historical documents. The United Kingdom exemplifies this type, relying on sources such as the Magna Carta (1215), the Bill of Rights (1689), and parliamentary statutes (Bradley and Ewing, 2011).
Rigid and Flexible Constitutions
Another classification distinguishes between rigid and flexible constitutions based on the ease of amendment. A rigid constitution requires a special, often complex, procedure for changes, ensuring stability but sometimes hindering adaptability. For instance, amending the US Constitution demands approval by two-thirds of Congress and ratification by three-fourths of the states, a deliberately arduous process (Barnett, 2016). Conversely, a flexible constitution, like that of the UK, can be altered through ordinary legislative procedures, allowing responsiveness to societal changes. This flexibility, however, may risk instability if amendments are made too hastily (Bradley and Ewing, 2011). Understanding these distinctions is crucial, as they influence how effectively a constitution balances continuity with the need for reform.
How Constitutions Come About
The formation of constitutions varies depending on historical, political, and social contexts. Written constitutions often emerge from significant events such as revolutions or independence movements. The US Constitution, for example, was created following the American Revolution, drafted through a constitutional convention to establish a new federal system (Barnett, 2016). Similarly, many post-colonial states adopted written constitutions upon gaining independence, often influenced by former colonial powers or international norms.
Unwritten constitutions, like the UK’s, typically evolve over centuries through gradual development rather than a single deliberative act. This evolutionary process involves the accumulation of customs, judicial precedents, and legislative acts. For instance, the UK’s constitutional framework developed through historical milestones such as the Glorious Revolution of 1688–89, which established key principles like parliamentary sovereignty (Bradley and Ewing, 2011).
Regarding rigid and flexible constitutions, their origins often reflect the drafters’ intentions. Rigid constitutions are typically designed during periods of transition to safeguard core principles, as seen in the US context. Flexible constitutions, however, may arise in systems prioritising adaptability, often in nations with stable, long-standing political traditions like the UK. Indeed, the method of formation arguably shapes a constitution’s ability to address contemporary challenges.
Conclusion
In summary, constitutions can be classified into written and unwritten, as well as rigid and flexible types, each with distinct characteristics and implications for governance. Written constitutions generally arise from deliberate acts following significant historical events, while unwritten ones evolve organically over time. Similarly, the rigidity or flexibility of a constitution often reflects the circumstances and intentions surrounding its creation. Understanding these types and their origins provides valuable insight into how legal frameworks adapt to societal needs or resist change. This knowledge is particularly relevant for students of constitutional law, as it highlights the dynamic interplay between history, politics, and legal principles in shaping governance. Furthermore, it underscores the importance of critically assessing whether a constitution’s type and formation process adequately meet the demands of modern states.
References
- Barnett, R. E. (2016) Our Republican Constitution: Securing the Liberty and Sovereignty of We the People. HarperCollins.
- Bradley, A. W. and Ewing, K. D. (2011) Constitutional and Administrative Law. 15th edn. Pearson Education Limited.

