The Agile Manifesto was drafted in 2001 by seventeen software developers who sought a better way to build software than the traditional, document-heavy "Waterfall" method. It consists of 4 Core Values and 12 Guiding Principles.
🚀 The 4 Core Values
The manifesto states that while there is value in the items on the right, we value the items on the left more:
Individuals and interactions over processes and tools.
Working software over comprehensive documentation.
Customer collaboration over contract negotiation.
Responding to change over following a plan.
📜 The 12 Principles of Agile
These principles provide the "how-to" for teams looking to implement Agile effectively.
1. Customer Satisfaction
Our highest priority is to satisfy the customer through early and continuous delivery of valuable software.
2. Welcome Change
Welcome changing requirements, even late in development. Agile processes harness change for the customer's competitive advantage.
3. Frequent Delivery
Deliver working software frequently, from a couple of weeks to a couple of months, with a preference for the shorter timescale.
4. Collocated Teams
Business people and developers must work together daily throughout the project.
5. Motivated Individuals
Build projects around motivated individuals. Give them the environment and support they need, and trust them to get the job done.
6. Face-to-Face Conversation
The most efficient and effective method of conveying information to and within a development team is face-to-face conversation.
7. Working Software as Progress
Working software is the primary measure of progress. (If it doesn't run, it doesn't count toward completion).
8. Sustainable Development
Agile processes promote sustainable development. The sponsors, developers, and users should be able to maintain a constant pace indefinitely. (Avoid "crunch time").
9. Technical Excellence
Continuous attention to technical excellence and good design enhances agility.
10. Simplicity
Simplicity—the art of maximizing the amount of work not done—is essential. (Don't build features the user hasn't asked for yet).
11. Self-Organizing Teams
The best architectures, requirements, and designs emerge from self-organizing teams rather than top-down command.
12. Regular Reflection
At regular intervals, the team reflects on how to become more effective, then tunes and adjusts its behavior accordingly. (Often called a "Sprint Retrospective").
📊 Agile vs. Waterfall: The Practical Difference
Feature | Waterfall | Agile |
|---|---|---|
Requirements | Fixed at the start. | Evolving throughout. |
Delivery | Once, at the very end. | Iterative (Small pieces). |
Customer Role | Involved at start/end. | Involved throughout. |
Risk | High (errors found late). | Low (errors found early). |
💡 Why does Agile matter?
In the modern world, market conditions change fast. If you spend 2 years building exactly what a customer asked for in 2024, by the time you deliver it in 2026, their needs have likely changed. Agile allows you to course-correct every 2 weeks.