What is the SDLC (software development life cycle)?
The software development life cycle (SDLC) describes the structured course of software development from idea to operation. It divides the work into phases such as analysis, design, development, testing, delivery and maintenance, creating predictability and quality.
Also known as: software development cycle · development life cycle · SDLC process
Where the SDLC is used
The SDLC gives software projects a reliable framework by dividing the work into traceable phases. Each phase has clear goals and deliverables, from requirements analysis through design and implementation to testing, delivery and ongoing operation. This way, risks are identified early and quality is systematically assured.
Whether classically sequential or iterative and agile, the SDLC structures the collaboration between business departments and development. In mid-sized companies it ensures that even tight budgets and short time windows are used efficiently and that software remains maintainable.
A practical example
For a new application, requirements are first clarified and prioritized with the business departments. This is followed by architecture and data-model design, after which development and testing proceed in short cycles. After automated tests, a first version goes live, and the software is then iteratively extended and maintained based on feedback – a full run through the life cycle.
Benefits & typical use cases
A clearly defined SDLC reduces risks, makes effort predictable and ensures consistent quality – especially when several parties collaborate.
- Predictable phases with clear deliverables and responsibilities
- Early defect detection through systematic tests and reviews
- Better maintainability through documented decisions and clean design
- Faster delivery via automated build and test pipelines
How it differs from related terms
The SDLC describes the entire life cycle, while concrete approaches such as agile methods or DevOps define how individual phases are implemented. An MVP is a typical outcome of early SDLC runs, and the finished software then runs on cloud infrastructure, often as part of a digital platform.
How smiit works with it
For the SaaS platform for Claimity AG, smiit used a streamlined SDLC to go into production in just six weeks. Requirements were clarified early, the multi-tenant architecture was cleanly designed and implemented in short cycles on Microsoft Azure – with Azure App Service, Azure Database for PostgreSQL and REST APIs. Testing, secure secret management via Azure Key Vault and GDPR-compliant operations were part of the life cycle from the start.
Common mistakes & misconceptions
- The SDLC is often equated with the rigid waterfall model, although it is a general framework that can also be implemented in an agile or iterative way.
- Many believe the life cycle ends when the software is delivered, when operation, maintenance and eventual decommissioning are explicitly part of it.
- It is frequently assumed that testing is a single phase at the very end, whereas in modern approaches quality assurance happens throughout the whole cycle.
Frequently asked questions
Which phases belong to the SDLC?
Typical ones are requirements analysis, design, development, testing, delivery and maintenance. Depending on the approach, these phases are run through once sequentially or repeatedly in short iterations.
Is the SDLC the same as agile development?
No. The SDLC describes the life cycle itself, while agile methods are one way to implement that cycle iteratively and flexibly. Classic, sequential approaches also follow an SDLC.
Is a structured SDLC worthwhile for small projects too?
Yes. Even a lightweight SDLC with clear phases and automated tests noticeably reduces defect rates and maintenance effort without burdening small teams with unnecessary bureaucracy.
How are the SDLC and DevOps related?
The SDLC describes the phases from idea to maintenance, while DevOps connects development and operations and automates transitions through build, test and deployment pipelines, for example. DevOps is therefore not a replacement for the SDLC but a way to implement it faster and more seamlessly.
What role does security play in the SDLC?
Security should not only be checked at the end but considered across all phases – from requirements analysis through secure design to automated security tests. This approach is often called security by design or DevSecOps.
Related terms
Sources & further reading
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