What Is the Difference Between Quality Assurance (QA) and QC (Quality Control)?

“Quality Assurance (QA) focuses on improving processes to prevent defects, while Quality Control (QC) focuses on identifying defects in the finished or developing product. In simple terms, QA is primarily prevention-oriented and process-focused, while QC is primarily detection-oriented and product-focused.”

QA vs. QC: Overview

QA and QC are both important parts of quality management, but they approach quality from different directions.

What Is Quality Assurance?

Quality Assurance focuses on how software is developed.

Its goal is to establish effective processes and practices that reduce the likelihood of defects.

QA activities can include:

• Process reviews
• Quality standards
• Development guidelines
• Test planning
• Requirement reviews
• Process improvement
• Quality metrics

What Is Quality Control?

Quality Control focuses on the actual software product.

Its goal is to identify whether the product contains defects or fails to meet defined requirements.

QC activities can include:

• Software testing
• Defect identification
• Test execution
• Product inspections
• Release validation

Key Difference

Quality Assurance (QA)	Quality Control (QC)
Process-focused	Product-focused
Primarily preventive	Primarily detection-focused
Improves how software is developed	Checks the quality of the software
Establishes quality practices	Identifies defects
Covers the broader quality process	Includes product inspection and testing

How Do QA and QC Work Together?

Consider a software development project.

QA establishes the development and testing processes.

QC checks the actual application against requirements and identifies defects.

The development team then fixes the issues, and the software is tested again before release.

Final Thoughts

QA and QC should work together rather than being treated as competing activities. QA helps build a process capable of producing quality software, while QC helps verify that the software actually meets the expected quality standards.