Agile software development

Agile software development is an iterative approach that organizes software work into short cycles, adapts plans through feedback, and delivers working software frequently.

Iteration (software development): A bounded cycle of software work that produces a reviewable increment or learning. Agile teams repeat these cycles to inspect progress and adjust what comes next.
Agile Manifesto: A 2001 statement of four values and twelve principles for Agile software development. It states the values underlying the approach without prescribing a single process.
Waterfall model: A software development model that organizes work into sequential phases, commonly with substantial planning before implementation. Its phase-driven sequencing contrasts with Agile's repeated planning and delivery.
Extreme Programming: An Agile software development method emphasizing short releases, close customer involvement, and disciplined engineering practices. It translates adaptive development into specific coding and testing practices.
DevOps: A set of practices and cultural ideas that bring software development and IT operations closer together. Frequent Agile delivery increased the need to coordinate development with deployment and operations.
Product backlog: An ordered list of work that may be needed to improve a product. Teams revise its priorities as feedback and circumstances change.
Empiricism: An approach to knowledge that relies on observation and experience. Agile planning depends on evidence from completed work and new feedback.
V-model: A systems development model that pairs design stages with corresponding verification and validation activities. It structures development around planned stages and matched tests rather than short adaptive cycles.
Kanban: A method for managing and improving work through visualized flow and limits on work in progress. Agile teams use Kanban to manage continuous work without fixed-length iterations.
Lean software development: An adaptation of Lean principles to software work, focused on flow, learning, and reducing waste. It shares Agile's emphasis on fast feedback and continuous improvement.

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