SDLC

SDLC (Software Development Life Cycle) is a structured process describing every stage software passes through — from the first idea, through building and deployment, to maintenance and retirement. The SDLC brings order to a team's work, makes a project more predictable, and keeps quality and cost under control at every stage.

How the SDLC works

The life cycle is usually divided into several phases:

1. Requirements analysis — gathering and clarifying business and technical needs;
2. Design — defining the architecture, data structures and interfaces;
3. Implementation — the actual coding that follows the design;
4. Testing — verifying correctness through unit tests, integration tests and acceptance tests;
5. Deployment — releasing the system into the production environment;
6. Maintenance — bug fixes, updates and further development after release.

How the phases connect depends on the chosen model. The waterfall model runs the stages sequentially, each starting only after the previous one ends. Iterative and agile approaches — like Scrum in the spirit of Agile — repeat the whole cycle in short loops, delivering the product incrementally. There are also the spiral and V models, which emphasize risk and verification.

Practical application

The SDLC is the backbone of how work is organized in any IT project — from a mobile app to a SaaS platform. Today the implementation, testing and deployment phases are increasingly automated in CI/CD pipelines, so code runs through tests and reaches production in a repeatable, controlled way. Applying the SDLC deliberately lets you catch defects early, when fixing them is many times cheaper than after release, and keeps a system's growth in check despite shifting requirements.