Explain Agility and Agile Process Model

Agile model is a combination of iterative and incremental process models with focus on process adaptability and customer satisfaction by rapid delivery of working software


  • Agility is dynamic, content specific, aggressively change embracing, and growth oriented 
  • It encourages team structures and attitudes that make communication more simplistic
  • It emphasizes rapid delivery of operational software and de-emphasizes the importance of intermediate work products
  • It recognizes that planning in an uncertain world has its limits and that a project plan must be flexible
  • Agility can be applied to any software process


Agile Process:

  • Any agile software process is characterized in a manner that addresses a number of key assumptions
    1. It is difficult to predict in advance which software requirements will persist and which will change. It is equally difficult to predict how customer priorities will change as the project proceeds.
    2. For many types of software, design and construction are interleaved.  That is, both activities should be performed in tandem so that design models are proven as they are created. It is difficult to predict how much design is necessary before construction is used to prove the design.
    3. Analysis, design, construction, and testing are not as predictable as we might be like

Agility Principles:

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

Agile Process Model are:

  • Extreme Programming (XP)
  • Adaptive Software Development (ASD)
  • Dynamic Systems Development Method (DSDM)
  • Scrum 
  • Crystal
  • Feature Driven Development (FDD)
  • Agile Modeling (AM)

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