🔰 Introduction:
When I first heard the terms SDLC and STLC, they felt confusing. But once I understood them with real-life examples, it became clear. In this blog, I’ll explain both — in the simplest way possible.
🔄 What is SDLC?
SDLC stands for Software Development Life Cycle
It describes all the steps involved in building software — from idea to delivery
✅ SDLC Phases:
Requirement Gathering – What does the client need?
Design – How will the system look & work?
Development – Coding begins here
Testing – QA team verifies the software
Deployment – Software goes live
Maintenance – Fix bugs or add features later
🏠 Real-life Example:
Imagine building a house:
You gather requirements (How many rooms?)
Create blueprints (Design)
Start construction (Development)
Inspect everything (Testing)
Move in (Deployment)
Fix leaks later (Maintenance)
🔍 What is STLC?
STLC stands for Software Testing Life Cycle
It describes the testing process inside the SDLC
✅ STLC Phases:
Requirement Analysis – What needs to be tested?
Test Planning – Who will test? What tools? Timeline?
Test Case Design – Writing test cases
Environment Setup – Prepare test setup (devices, browser, etc.)
Test Execution – Run test cases, find bugs
Test Closure – Final report after testing
🧪 Real-life Example:
Continuing the house example:
You check the plan (Requirement Analysis)
Plan how to inspect (Test Plan)
Make a checklist (Test Case Design)
Bring measuring tools (Environment Setup)
Do the inspection (Execution)
Submit final report (Closure)
🎯 Why They Matter?
Understanding SDLC helps testers know where they fit in
Knowing STLC helps you follow a structured approach to testing
In interviews, questions like “Difference between SDLC & STLC” are common
✅ Conclusion:
SDLC and STLC are not difficult once you relate them to real life. The more you test, the more you’ll appreciate these processes.
🙋♀️ Over to You:
Did this blog help you understand SDLC and STLC? Comment below — and share it with your testing friends!
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