Difference Between Agile And Waterfall Model

Agile Development is one of the methodologies use in software engineering to help develops software. Today, there are a lot of different approach to Agile method. However, they all share the same value and principals. This method is value interactions over team and customer, workable software, and adaptable to change. Over the processes, documentation, contract, and plan. Agile developer also following 12 principle. 1, Their first priority is to delivery fast and quality software that will satisfy customer. 2, be adaptable to any change in requirement at any point in time, Agile development always

Introduction to Agile Methods by Hayes and Andrews gives detailed-oriented information about different aspects of agile methods like why there is a need for new software development processes and pitfalls of traditionally methodologies and how this lead to emergence of agile methods. They describe various existing agile methods but describes only one in great detailed – Extreme Programming(XP). They define Extreme Programming as agile, adaptive software methodology having well defined values - Communication, Simplicity, Feedback, and Courage. Failing in achieving this values will result in failing Extreme Programming. Extreme Programming is used only when you have complete understanding of the business and requirements. Extreme Programming follow a series of iteration to deliver the final project. Initially the story heard from the customer is broken down into smaller stories such that the developers can assign time to develop that stories and then its deliver to the customers for feedback. Coach plays a vital role in Extreme Programming. Afterwards Hayes and Andrews describe how XP differs from traditional methodologies. They also explain the common misconception about Extreme Programming is spread around the world. There are only fewer companies in the world that uses Extreme Programming because people are afraid of changing to new methods.

“Agile” was first introduced in 2001, by a team of software engineers looking to improve their adaptiveness and responsiveness to ever-changing requirements. Not knowing where to begin, the team began by formulating principles, which they would use to guide their new development process. Which, in turn, lead to the creation of the Agile Manifesto, and thus a new methodology was born.

The Agile Methodology Principles makes the development much faster because the primary importance is given to the customer satisfaction and continuously delivers product. Even though requirements change at the ending phase the product is developed. The Agile development insist the self-organizing team which can create requirements, best architectures, best models. The Agile development promotes a distinct way of thinking to build things and methods to deliver continuous improvement of product. It facilitates to make best practices and decisions together. It a development to promote the adaptive planning, continuous improvement, evolutionary development and delivery, and required time to complete work. It encourages for rapid response to change in the whole development cycle. The project team prefers agile development to move in a creative and quick way. The project progress also depends on working software and project environment and support is provided and built by the individuals. They promote the sustainable environment. Constant attention is provided to the technical excellence and best models are given by the agile methodology. This principle helps the project team members

On the other hand, Agile methodology is a development method that promotes teamwork and flexibility throughout the life-cycle; it is a development method that supports using a small, cross functional team to provide software frequently in small increments on a regular cycle. It implements regular contact with employees and is more flexible compared to the Waterfall Method. There are several different Agile software development methodologies like Crystal Methods, XP, Dynamic System Development Model (DSDM), and Scrum, all examples are focused on flexibility and focuses on keeping code simple, testing

Next Iteration: During the system testing if there are major changes from the client then such changes are included in the next Iteration.

What is Agile? What is Agile Project Management? Agile is “not a methodology. The Agile movement seeks alternatives to traditional project management. Agile approaches help teams respond to unpredictability through incremental, iterative work cadences and empirical feedback. Agilists propose alternatives to waterfall, or traditional sequential development” (Agile Methodology). Agile Project Management on the other hand is, “continuous improvement, scope flexibility, team input, and delivering essential quality projects” (Agile for Dummies).

Testing is often handled by a quality assurance team. The team upon taking delivery of the product refers back to the documents created during conception and ensures that all of the requirements are satisfied by the solution. This team documents the project and uses business cases or test cases to determine whether the solution actually is the complete solution and whether or not it actually works in its entirety. This team generally hands off the functioning solution, its documentation and a user manual to the next phase: installation.

In Early 2000s, various software systems development methodologies were introduced and were started getting popular. One of them was agile method. Agile is a group of the latest and popular software systems development life cycle methodologies work in iterative way. All the requirements/needs and solutions are solved through collaboration between a development team and a business stakeholder. Agile method usually enhances an organized project management method which promotes regular assessment and revision. And the scrum is a sub group of agile. It is an iterative and incremental agile software development methodology for managing complex software and product development (“The Scrum Guide”).

No requirements added to an iteration once it has started. New requirements are evaluated by stakeholders and prioritized, thus preventing gold-plating and scope creep.

Agile techniques should be used to solve the current issues faced by the company as agile techniques normally being used by the software industry help the business to act in response under the unpredictable situations faced. In Agile methodologies opportunities are been provided to evaluate whether the project is under the direction all through its development cycle. All this is being accomplished with the help of regular tempo kept in work, and the teams must show a product which is having the desired potential.

Agile is an iterative and incremental (evolutionary) approach to software development which is performed in a highly collaborative manner by self-organizing teams within an effective governance framework, with "just enough" ceremony, that produces high quality solutions, in a cost effective and timely manner which meets the changing needs of its stakeholders [1].

the employees of the organization. Each iteration has a time period defined with a set of goals.

Agile is a member of software development mode. Actually It is not a technique. I think not only it is a methodology, but also it is a process of development software. It will show and guide us to finish the development step by step according to the project required. However this kind of development mode is driven by human. The human will control the direction of the project.

Yet another method is extreme programming (XP). It is also a software development method which improves software quality and responsiveness to changing customer requirement (extreme). This program has proved very successful at many companies. It is successful because it focuses on customer satisfaction. Extreme programming emphasizes teamwork. In this program, managers, customers and developers are all equal partners in a team. Extreme programing improves a software project in different ways which are communication, simplicity, feedback, respect and courage. In this method, programmers constantly communicate with their customers. They keep their design simple and clean. They get feedback by testing their software and deliver the system to the customer as soon as possible and implement changes as suggested. Every team member involvement is essential for the success of the program. With this foundation extreme programmers are able to courageously respond to changing requirement and technology (Extreme Programming).