Agile describes a set of guiding principles that uses iterative approach for software development, while Scrum is a specific set of rules that are to be followed while practicing the Agile software development.
Agile management represents various software-development methodologies that have been influenced by iterative and incremental development, which includes Extreme Programming (XP), Rational Unified Process (RUP), Scrum, and others. Agile process or methods provide an environment where there is constant evolution in requirements and evolution as a result of collaboration between self-organising cross-functional teams. Agile methodologies foster a disciplined project-management approach that encourages a set of best practices, allowing a rapid delivery of high-quality software and enhancing a business approach, which aligns development with the customer needs. The Agile methodologies stand in contrast to the traditional waterfall methodology, where all the requirements are initially analysed and documented before the development begins. While in Agile approach, requirements are like the actual software-development advances within each iteration. This approach provides flexibility in accommodating changes in the requirements and priorities of the business.
Also known as Manifesto for Agile Software Development, the Agile Manifesto is a formal declaration of 4 key values and 12 principles supporting an iterative approach to software development. The Agile development methodology enables assessment of project direction throughout the development lifecycle. This is achieved through regular iterations, and when revaluation is done at every iteration, it greatly reduces the development costs and time. Agile helps the companies to build the right product. Benefits of Agile include as follows:
In the traditional waterfall model, the high-value features are developed and delivered in longer cycles compared to the Agile approach, which enables delivery within short cycles. This enables the vendors to be more responsive to the development requests of the customers.
Adopting Agile benefits the vendors by having an improved customer satisfaction and customer retention, leading to more customer contacts through positive references. The Agile allows the vendor’s focus to be on the development effort of high-value features, decrease the overheads, and improve efficiency.
With Agile development, there is a regular inspection of the working product, with testing integrated at every iteration, as it develops throughout the lifecycle. This in turn retains the quality of the product and also allows the product owner to make necessary adjustments whenever a quality issue arises.
Agile methodology is a collaborative approach that encourages active user participation throughout the product development. This gives an exceptional and clear visibility of the project’s progress and product development to the stakeholders.
Agile development process has fixed timescale where the requirements emerge and evolve as the project progresses and the product is developed. This enables a fixed budget.
In Agile methodology, small incremental releases are made visible to the product owner throughout the development cycle, which helps identify issues at an early stage, and it makes easier to respond to change, if any. Agile development ensures clear visibility, which allows necessary decisions to be taken at the earliest possible opportunity.
Scrum, on the other hand, is a subset of Agile. A Scrum is a simple and flexible Agile methodology for software development. The Scrum is not a technique or a process but a lightweight and simple framework to address complex problems of a project and deliver a high-value product creatively. The major distinguishing attributes of Scrum are as follows:
The development in Scrum is done in sprints, which are 1, 2, and 3 weeks in length. The Scrum team consists of:
In the traditional waterfall model, when the business and technical requirements are documented and detailed, it results in endless documentation. The Scrum makes use of user stories to describe the functions needed to be developed. A tool called Pivotal Tracker is used to store these user stories in a backlog. If a change needs to be made or a need arises to add to the user stories, in that case the team can adjust as early as the next sprint. This allows the business to change their minds and the development team to be flexible enough to adjust to those changes. The ability to accommodate change is a powerful attribute of the Scrum methodology.
In Scrum methodology, the communication between business users takes place on a daily/weekly basis according to the sprint schedule. This close communication and collaboration is a crucial factor, promoting the success of the Scrum methodology. The Scrum team achieves collaboration in following ways:
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