Manual testing is best for

• exploratory testing (finding the unexpected)
• usability feedback
• rapid validation during early development
• scenarios hard to automate (visual/UI judgement)

Automated testing is best for

• regression checks
• repeated workflows
• CI pipelines
• fast feedback for developers

A simple decision framework

Ask:

1. Will we run this test many times?
2. Is the behavior stable enough to automate?
3. Is the test deterministic?
4. Is the automation cost worth it?

Diagram: test strategy mix

  graph TD
A[Feature] --> B{Stable & repeatable?}
B -- No --> C[Manual / Exploratory]
B -- Yes --> D{High risk / frequent change?}
D -- Yes --> E[Automate + keep manual checks]
D -- No --> F[Automate basic regression]

Key takeaway

Good teams combine both.

Automation does not replace thinking.