Summary
The software development life cycle (SDLC) is the process teams use to plan, build, test, release and maintain software. Its usual phases are planning, requirements, design, development, testing, deployment and maintenance. Models such as Agile and Waterfall organize those phases in different ways, and the right choice depends on how well the requirements are known.
What is the software development life cycle?
The software development life cycle, usually shortened to SDLC, is a structured process for turning an idea into working software and keeping it healthy after launch. It gives everyone involved a shared view of what happens, in what order, and who is responsible.
Without a process, projects tend to overrun, miss requirements or ship with defects that are expensive to fix later. A clear SDLC does not have to mean heavy paperwork. It simply means making decisions at the right time.
The 7 phases of the SDLC
Teams name these stages differently, but the work is broadly the same:
- Planning: define the goal, the budget, the timeline and whether the project is worthwhile.
- Requirements: record what the software must do, who will use it and how success will be measured.
- Design: plan the architecture, the data model and the user interface.
- Development: write the code, review it and keep it in version control.
- Testing: use unit, integration and user acceptance tests to find defects.
- Deployment: release the software to users, ideally through an automated pipeline.
- Maintenance: fix issues, apply security updates and add features as needs change.
Common software development models
A model describes how the phases are organized. These are the ones you will meet most often:
- Waterfall: each phase finishes before the next begins. It suits projects with fixed, well-understood requirements.
- V-model: like Waterfall, with a test stage planned for each development stage. It is common where safety and compliance matter.
- Agile: work happens in short cycles, and working software is reviewed often. It suits projects where requirements will change.
- Scrum: a popular form of Agile, built around fixed sprints and defined roles.
- Kanban: work flows continuously through a visible board, with limits on work in progress.
- DevOps: development and operations share responsibility, with automation connecting build, test and release.
How to choose the right model
Ask how likely your requirements are to change. If you are building a new product and still learning what users need, an Agile approach lets you adjust as you go. If you are working to a fixed regulatory specification, a more sequential model may be safer. Many real projects combine the two, with careful upfront design followed by iterative delivery.
What affects software development cost?
There is no single price for software, because cost depends on the work involved. The main factors are:
- Scope: the number of features, screens and user roles.
- Integrations: connections to payment, ERP, CRM or other systems.
- Quality needs: security, performance and compliance requirements.
- Platforms: web, Android, iOS, or all three.
- Team: the size and experience of the people involved.
- Maintenance: hosting, support and updates after launch.
A focused first version (often called an MVP) is usually the most sensible way to control cost, because you learn from real users before investing further.
Choosing a software development company
Look for a team that asks about your business before it talks about technology. Review work they have actually shipped, ask who will write the code, and confirm in writing that you will own the source code. Check how they handle testing, communication and support after launch.
HEWN CRAFT is a custom software development company in Surat, India. See our engagement models or tell us about your project.