# Part 10: Constitutional Amendment
**Articles: 166-169**

## Core Idea
The Constitution provides for its own amendment through two procedures: ordinary (for partial reforms) and aggravated (for total revision or fundamental rights changes). Both require enhanced majorities and, in some cases, popular referendum.

## Frameworks Introduced

### Ordinary Procedure (Article 167)
- **Initiative**: 3/5 majority in each chamber, or 2/3 majority in one chamber and absolute majority in the other
- **Approval**: Requires absolute majority in both chambers
- **Referendum**: If requested by 1/10 of members of either chamber within 15 days after approval

### Aggravated Procedure (Article 168)
- **Initiative**: 2/3 majority in both chambers
- **Dissolution**: Cortes are immediately dissolved
- **New Chambers**: Newly elected chambers must approve by 2/3 majority
- **Referendum**: Mandatory popular referendum for ratification

## Key Concepts
- **Amendment Initiative**: Can be proposed by Government or Cortes (Art. 166)
- **Partial Reform**: Changes to specific articles or sections
- **Total Revision**: Comprehensive constitutional reform
- **Fundamental Rights Protection**: Any amendment to fundamental rights requires aggravated procedure (Art. 168.1)
- **Eternity Clause**: Implicit protection of core constitutional principles through aggravated procedure

## Mental Models
- Use **amendment as sovereign act** — the people can change their constitutional order
- Think of **aggravated procedure as safeguard** — protects core constitutional values
- Apply **flexible constitution principle** — Constitution can adapt to social changes

## Anti-patterns
- **Informal amendment**: Changing constitutional meaning through ordinary law
- **Evasion**: Using ordinary procedure for changes that require aggravated procedure

## Key Takeaways
1. Constitution can be amended but with higher thresholds than ordinary laws
2. Partial reforms use ordinary procedure with possible referendum
3. Total revisions or fundamental rights changes require aggravated procedure
4. Aggravated procedure includes dissolution, new election, and mandatory referendum
5. Amendment power belongs to the people, exercised through their representatives

## Connects To
- **Part 00**: Amendment procedures implement the principle that sovereignty resides in the people
- **All Parts**: Amendments can affect any part of the Constitution