Error
An error is a human action that produces an incorrect result, leading to the introduction of a defect into a work product.
“A human action that results in a defect.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is Error?
Errors are made by people during activities such as requirements analysis, design, coding, or testing. Some errors introduce defects that later cause failures.
Human mistake: Errors originate from incorrect actions or decisions.
Relationship to defects: Errors may introduce defects into software or documentation.
Quality improvement: Understanding errors helps prevent future defects.
Real World Example
A hospital medication system shows a different dosage warning in test than the one specified by the clinical safety rule.
The team needs precise language to separate what was observed, what should have happened, and whether the difference represents a reportable issue. Error provides that distinction.
The tester records the steps, data, observed behavior, expected behavior, and evidence so triage can focus on patient safety impact instead of vague descriptions.
The issue is handled faster because Error helps everyone discuss the problem using a shared testing vocabulary.
Practice Questions
Question 1
Which statement BEST describes Error in the context of ISTQB terminology?
Question 2
A tester needs to explain Error to a non‑technical stakeholder. Which approach is MOST appropriate?
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