every technology organization today seems to practice the agile methodology for software development, or a version of it. we developers were expected to know “the spec,” as the complete documentation was called, just as well as the documents’ authors did, and we were often chastised if we forgot to properly implement a key detail outlined on page 77 of a 200-page document. other times, a capability was widely successful but required reengineering to support the necessary scalability and performance. invented in 1970, the waterfall methodology was revolutionary because it brought discipline to software development to ensure that there was a clear spec to follow.
we couldn’t afford to do all of the detailed documentation up front, and we needed a more iterative and collaborative process. in 2001, a group of experienced software developers got together and realized that they were collectively practicing software development differently from the classical waterfall methodology. today, we often define them with user personas to illustrate different roles in a workflow the software is supporting or different types of customer needs and behaviors. many agile frameworks that provide specifics on development processes and agile development practices, aligned to a software development life cycle.
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.
they wrote four major principles for agile project management, with the goal of developing better software: working software over comprehensive documentation. customer collaboration over contract negotiation. responding to change over following a plan. agile software development the agile movement is not anti-methodology, in fact many of agile software development is a set of methods and practices where solutions evolve through that means that each team is going to have its own methodology, which will be different in either small, . 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 isn’t defined by a set of ceremonies or specific development techniques. rather, agile is a group of agile is a term used to describe software development approaches that employ continual planning, agile scrum methodology lean software development kanban extreme programming (xp) crystal dynamic systems,
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