Agile Manifest was formed in 2001 in Snowbird Utah Resort by 17 Agile Enthusiasts who were experimenting with Software Engineering – and Development practices:

The above authors and many agile enthusiasts singed Agile Manifesto Values and Principals that are guided us since then:

We are uncovering better ways of developing
software by doing it and helping others do it.
Through this work we have come to value:

Individuals and interactions over processes and tools
Working software over comprehensive documentation
Customer collaboration over contract negotiation
Responding to change over following a plan

That is, while there is value in the items on
the right, we value the items on the left more

Principles behind the Agile Manifesto

We follow these principles:

1. Our highest priority is to satisfy the customer
   through early and continuous delivery
   of valuable software.
2. Welcome changing requirements, even late in
   development. Agile processes harness change for
   the customer’s competitive advantage.
3. Deliver working software frequently, from a
   couple of weeks to a couple of months, with a
   preference to the shorter timescale.
4. Business people and developers must work
   together daily throughout the project.
5. Build projects around motivated individuals.
   Give them the environment and support they need,
   and trust them to get the job done.
6. The most efficient and effective method of
   conveying information to and within a development
   team is face-to-face conversation.
7. Working software is the primary measure of progress.
8. Agile processes promote sustainable development.
   The sponsors, developers, and users should be able
   to maintain a constant pace indefinitely.
9. Continuous attention to technical excellence
   and good design enhances agility.
10. Simplicity–the art of maximizing the amount
    of work not done–is essential.
11. The best architectures, requirements, and designs
    emerge from self-organizing teams.
12. At regular intervals, the team reflects on how
    to become more effective, then tunes and adjusts
    its behavior accordingly.