Introduction to Software Quality Assurance (SQA)

What is Software Quality?

Quality means the product:

• works as intended (correctness)
• is easy to use (usability)
• performs well (performance)
• is secure (security)
• is reliable over time (stability)

What is SQA?

Software Quality Assurance (SQA) is the set of activities that ensure quality is planned, built, and verified.

SQA is broader than “testing”. It includes:

• defining processes and standards
• reviews (requirements, design, code)
• test planning
• automation strategy
• continuous improvement

QA vs QC (Quick distinction)

• QA (Quality Assurance): process-focused — “Are we building the product the right way?”
• QC (Quality Control): product-focused — “Does this product meet the requirements?”

Testing is mostly part of QC, but QA enables and improves testing.

Where SQA fits in a team

• Developers: unit tests, code reviews, automation
• QA Engineers: test strategy, exploratory testing, automation suites
• Product/Design: acceptance criteria, usability
• DevOps: CI pipelines, quality gates

Diagram: Quality as a lifecycle

diagram Diagram mermaid

  graph TD
A[Requirements & Acceptance Criteria] --> B[Design Reviews]
B --> C[Implementation]
C --> D[Automated Tests]
D --> E[Manual / Exploratory Testing]
E --> F[Release]
F --> G[Monitoring & Feedback]
G --> A

Key takeaway

Quality isn’t something you “add at the end”.

Quality is an engineering habit.

Visualize it

The Software Testing Life Cycle (STLC) moves through six stages from understanding requirements to formally closing out testing.

diagram Software Testing Life Cycle mermaid

  flowchart LR
A["Requirement analysis"] --> B["Test planning"]
B --> C["Test case design"]
C --> D["Environment setup"]
D --> E["Test execution"]
E --> F["Test closure"]

The STLC flows from requirement analysis through to test closure.