SDLC V/S STLC: Understand the difference

In this blog, we will try to understand the difference between SDLC and STLC. Let us get started

What is SDLC?

SDLC stands for Software Development Life Cycle, SDLC is defined as the process of different steps to be executed in order to design, develop and test high-quality software.
Software Development Life Cycle has the following phases:

  1. Requirement Gathering and Analysis
  2. Design
  3. Implementation
  4. Testing
  5. Deployment and Maintenance

Click here to learn about SDLC phases in detail.

What is STLC?

STLC stands for Software Testing Life Cycle, STLC is defined as the process of different steps to be executed in a definite sequence to ensure that the quality goals have been met. Software Testing Life Cycle has the following phases:

  1. Requirement Gathering Stage
  2. Planning and Control
  3. Analysis and Design
  4. Implementation and Execution
  5. Evaluating exit criteria and reporting
  6. Test Closure

Click here to learn about STLC phases in detail.

Difference between SDLC and STLC

SDLCSTLC
SDLC is the acronym of the Software Development Life Cycle.STLC is the acronym of the Software Testing Life Cycle.
In SDLC testing is also included.In STLC complete focus is on software testing only.
A business analyst is responsible for making plans and designs.A quality analyst from the testing team is responsible for making plans and designs
Code is written as per the design document in the SDLC.Test case writing is done on the basis of test plans and designs in STLC.
SDLC helps an organization to complete the successful development of the software.STLC helps an organization to build quality and bug-free software.

Parellel working of SDLC and STLC

SDLC and STLC have a different purpose and also there is a difference in the process of both but ultimately both of them has the same goal to build a high-quality product matching with customer expectations. To attain this goal one cannot be conducted without the other. As software is being developed it must be tested to verify that team is building the right product.


Please tell us about your SDLC V/S STLC knowledge before-and-after reading. I bet you’ll have something to say !!!

Happy learning 🙂

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