agile software development is an umbrella term for a set of frameworks and practices based on the values and principles expressed in the manifesto for agile software development and the 12 principles behind it. a lot of people peg the start of agile software development, and to some extent agile in general, to a meeting that occurred in 2001 when the term agile software development was coined. there were a lot of things that they didn’t agree upon, but there were a few things that they were able to agree upon, and that ended up becoming the manifesto for agile software development.
the two main things the agile manifesto did was to provide a set of value statements that form the foundation for agile software development and to coin the term agile software development itself. ultimately, agile is a mindset informed by the values contained in the agile manifesto and the 12 principles behind the agile manifesto. so agile methodologies are the conventions that a team chooses to follow in a way that follows agile values and principles. if you extend the idea of agile as a mindset, then people seeking business agility ask themselves, “how might we structure and operate our organization in a way that allows us to create and respond to change and deal with uncertainty?” you might say that business agility is a recognition that in order for people in an organization to operate with an agile mindset, the entire organization needs to support that mindset.
in 2009, a group working with martin wrote an extension of software development principles, the software craftsmanship manifesto, to guide agile software development according to professional conduct and mastery.  the principle of co-location is that co-workers on the same team should be situated together to better establish the identity as a team and to improve communication. one key of adaptive development methods is a rolling wave approach to schedule planning, which identifies milestones but leaves flexibility in the path to reach them, and also allows for the milestones themselves to change. in the extremes, a predictive team can report exactly what features and tasks are planned for the entire length of the development process. situation-appropriateness should be considered as a distinguishing characteristic between agile methods and more plan-driven software development methods, with agile methods allowing product development teams to adapt working practices according to the needs of individual products.  agile software development has been widely seen as highly suited to certain types of environments, including small teams of experts working on greenfield projects,:157 and the challenges and limitations encountered in the adoption of agile software development methods in a large organization with legacy infrastructure are well-documented and understood.
below are some common examples: a goal of agile software development is to focus more on producing working software and less on documentation. agile software development is often implemented as a grassroots effort in organizations by software development teams trying to optimize their development processes and ensure consistency in the software development life cycle. this is a common trap for teams less familiar with agile software development where the teams feel obliged to have a complete understanding and specification of all stories. efforts to add scope to the fixed time and resources of agile software development may result in decreased quality. both iterative and agile methods were developed as a reaction to various obstacles that developed in more sequential forms of project organization. a common criticism of this practice is that the time spent attempting to learn and implement the practice is too costly, despite potential benefits.
one thing that separates agile from other approaches to software development is the focus on the people doing the agile software development the agile movement is not anti-methodology, in fact many of an agile software development process always starts by defining the users and documenting a vision, . agile software development refers to a group of software development methodologies based on iterative development, where requirements and solutions evolve through collaboration between self-organizing cross-functional teams. agile is a term used to describe approaches to software development emphasizing incremental delivery, team collaboration, continual planning, and continual learning, instead of trying to deliver it all at once near the end.
the agile approach embraces the constant changes that occur in the development of technology – allowing teams to agile is an iterative approach to project management and software development that helps teams deliver value to their agile is a term used to describe software development approaches that employ continual planning,,
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