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Welcome changing requirements, even late in development. Agile processes harness change for the customer's competitive advantage.
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Deliver working software frequently, from a couple of weeks to a couple of months, with a preference to the shorter timescale.
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Working software is the primary measure of progress.
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Agile processes promote sustainable development. The sponsors, developers, and users should be able to maintain a constant pace indefinitely.
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Simplicity--the art of maximizing the amount of work not done--is essential.
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At regular intervals, the team reflects on how to become more effective, then tunes and adjusts its behavior accordingly.