Agile Development Models | Software Engineering

Agile Development Models has Iterative Waterfall model was formerly a common way to finish a project. However, today’s developers confront a number of issues while using it to create applications. The key challenges were dealing with customer change requests during project development, as well as the significant cost and time required to make these changes. To address these flaws in the Waterfall methodology, the Agile Software Development model was introduced in the mid-1990s.

Agile Development Model

The Agile Development Models methodology was created to assist a project in fast adapting to change requests. As a result, the Agile model’s primary goal is to speed up project completion. Agility is essential to complete this challenge. Agility is achieved by tailoring the process to the project and eliminating processes that aren’t required for the project. Anything that wastes time and effort is also avoided.

The Agile model actually refers to a collection of development methodologies. These processes have certain basic properties in common, but there are some subtle distinctions between them. The following are a few Agile SDLC models:


  • Crystal\s
  • Atern
  • Development based on features
  • Scrum
  • Extreme programming is a type of programming that involves a (XP)
  • Development that is lean
  • Process that is unified


The requirements are split into numerous little sections that can be developed incrementally in the Agile paradigm. Iterative development is used in the Agile methodology. Each incremental component is created iteratively. Each iteration is supposed to be short and manageable, and it should only take a couple of weeks to complete. One iteration is planned, built, and released to clients at a time. There are no long-term plans in place.


Iterative and incremental process models are combined in the agile model. The following are the steps involved in agile SDLC models:


  • Gathering requirements
  • Analysis of Requirements
  • Design Coding
  • Testing at the unit level
  • Acceptance testing is a type of testing that is used to


A Time Box is the amount of time it takes to finish an iteration. The greatest length of time required to provide an iteration to clients is referred to as a time-box. As a result, the end date for an iteration remains unchanged. Though, if necessary, the development team might choose to limit the delivered functionality during a Time-box in order to meet the deadline. The delivery of an increment to the client after each Time-box is the basic principle of the Agile Development Models  approach.

Principles of Agile model:

  • Each Agile project usually includes a customer representative on the team to maintain close touch with the customer during development and to obtain a thorough grasp of varied requirements. Stakeholders and the customer representative assess and re-evaluate the requirements at the conclusion of each iteration.
  • Rather of thorough documentation, the agile strategy relies on the release of working software.
  • Frequent delivery of incremental software versions to the customer representative at weekly intervals.
  • Customer suggestions for requirement changes are encouraged and quickly implemented.
  • It emphasizes the necessity of having effective team members and improving communication among them. It has been established that face-to-face communication, rather than the exchange of formal paperwork, might improve communication among development team members.
  • The size of the development team should be kept small (5 to 9 persons) to allow team members to engage in meaningful face-to-face communication and work in a collaborative setting.
  • Pair Programming is commonly used in Agile development processes.
  • Two programmers collaborate at a single workstation in Pair programming. While one is coding, the other is reviewing the code as it is entered. Every hour or so, the two programmers trade duties.


  • When compared to programmers working alone, pair programming produces well-written compact programmes with fewer errors.
  • It cuts the project’s total development time in half.
  • After each iteration, customer service personnel get the idea of new software goods. As a result, he can easily adjust any need if necessary.
  • Software deployment is faster, which contributes to the customer’s increased trust.
  • Can adapt and respond more quickly to rapidly changing requirements.
  • Allows for immediate feedback, which may then be used to enhance the software in the following release.
  • Not the process, but the people. People and interactions are given precedence over processes and tools.
  • Consistent focus on technical quality and aesthetics.


  • Because there are no formal records, there is misunderstanding, and crucial decisions made at different stages can be misconstrued by different team members at any time.
  • When a project is completed and the developers are assigned to another project, maintaining the established project can become a difficulty due to a lack of sufficient documentation.

Agile software development is a time-bound, iterative method to software development that creates software incrementally from the start of a project rather than trying to provide everything at once.

Why Agile?

Technology is growing at a faster rate than ever before, forcing global software organizations to function in a constantly changing environment. Because these companies operate in a constantly changing environment, it’s impossible to compile a comprehensive list of software requirements. Without these prerequisites, any traditional software paradigm becomes almost impossible to implement.

Traditional software development models, such as the Waterfall Model, rely on fully describing requirements, creating, and testing the system, and are not designed for quick software development. As a result, a traditional software development strategy is unable to produce the desired outcome.

Agile software development comes to the rescue in this situation. It was created with the intention of catering to the needs of a fast changing environment by adopting the concept of incremental development and producing the final result.


Development in Agile Development Models:

  • Design and implementation are regarded the fundamental activities in the software development process in Agile development.
  • Other tasks such as requirements elicitation and testing are included in the Design and Implementation phase.
  • Iteration occurs across activities in an agile methodology. As a result, rather of being developed independently, the requirements and design are produced simultaneously.
  • The process of allocating requirements and planning and developing a design in a number of steps. Unlike the traditional methodology, where requirements collecting must be finished before moving on to the design and development phase, Agile development allows for more flexibility.
  • The focus of an agile workflow is on code development rather than documentation.

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