Legacy of Agile

Over the last decade, organizations have seen a steep rise in the need to rapidly deliver high quality software solutions to meet everchanging market demands and manage fierce competition. In tandem, IT companies supporting these organizations, have switched to agile methodology to keep up with the growing demand for accelerated software delivery.

Understanding Agile

The agile model, a combination of incremental and iterative processes, originated to speed up software delivery, ensure customer satisfaction, and offer the flexibility to adapt and improve continuously. Under the agile model, business requirements were broken down into smaller chunks, enabling the development team to deliver software in shorter iterations, far more regularly. As agile methods gained ground, new automation technologies and streamlining processes began to crop up, allowing development teams to integrate smaller chunks of code continuously.

However, these smaller chunks of code had to be tested continuously so that high-quality code could be integrated several times into the trunk. While this increased the software development efficiency, it burdened the downstream testing team and operations team with continuous testing and deployment. In turn, the delivery of the overall software product got delayed, thereby defeating the agile methodology's entire purpose.

The journey from Agile to DevOps

Soon, organizations realized that the entire software development lifecycle should be treated as a single process, and most of it should be automated. The development and operation teams working in silos were merged, leading to the emergence of DevOps.

DevOps is the amalgamation of practices, cultural philosophies, and tools that enables an organization to deliver applications/services at high velocity and improve products consistently. Organizations that have moved away from traditional software development processes towards DevOps reap the benefits of faster go-to-market and increased customer satisfaction.

Elements of DevOps: CI/CD

Continuous integration is a software development practice where developers merge code changes regularly into a central repository which is then used to run automated builds and tests. The idea behind continuous integration is to identify and address bugs faster, improve quality, and reduce the time to market.

Continuous delivery is a software development practice wherein code changes are automatically built, tested, and integrated for release, taking continuous integration a step further by deploying code changes to a testing/production environment after the build phase.

Continuous deployment is another widespread DevOps practice wherein each new build is automatically deployed whenever any significant changes are made to the code.

Waterfall	Agile	DevOps
Sequential Linear stages Teams Operate in functional Silos Comprehensive Planning and Documentation Extremely limited to new business Needs	Iterative mode of development Small, High Functioning , Collaborative Teams Continuous Integration was integral part of Dev Teams Emphasis on Faster time to market Practice of Automation	Flexible Continuous Evolution Dev And Ops Collaboration Continuous Integration, Testing, Delivery and Deployment High on Automation for CI/CD Emphasis on Faster time to market

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