A structured process for planning, creating, testing, and deploying software systems through defined phases including requirements analysis, design, implementation, testing, deployment, and maintenance. It helps teams plan, execute, and deliver projects on time and within scope through structured methodologies.
Software Development Life Cycle
Software Development Life Cycle (SDLC) is the structured process teams use to take software from an idea to a running, maintained system. It breaks the work into recognizable phases, requirements, design, implementation, testing, deployment, and maintenance, so that quality and progress can be managed rather than left to chance. Whether run as waterfall, iterative, or agile, the SDLC is the backbone that gives a delivery effort predictability.
- Requirements and design - Define what is being built and how it will be structured before code is written.
- Implementation - Build the software against the agreed design and contracts.
- Testing - Verify behavior and catch defects before they reach production.
- Deployment and maintenance - Ship the system and keep it healthy, secure, and evolving over time.
In the API world the SDLC gets specialized into an API lifecycle, where design-first practices, mocking, contract testing, and governance are woven into each phase. I spend a lot of time arguing that an API is not a one-time build but a product with its own life cycle, versioned, monitored, deprecated on purpose, and governed continuously. Getting that discipline right is what separates an estate that can safely serve agents and partners from one that quietly accumulates risk with every release.
Referenced on the API Evangelist blog
Where this standard shows up across sixteen years of my writing at apievangelist.com — how it fits into API design, governance, and the agentic turn.
Establishing a Common API Lifecycle
2024-09-02
