When you are evaluating options, requirements, or standards, you are working with a criterion; when you list multiple such standards, you are referring to criteria. These terms are distinct in both form and function, yet they are frequently confused because they are related. Criterion is singular and describes a single principle or test used to judge, assess, or decide. Criteria is plural and describes a set or group of such principles or tests. Using them correctly ensures clarity in assessment, requirements documentation, policy design, and decision frameworks.
Definitions and Core Meanings
Criterion: the singular standard
Criterion (singular) is a principle, rule, test, or condition used as a basis for judgment, evaluation, or decision-making. It names one identifiable measure that determines acceptability, suitability, or quality. In practice, a criterion is a specific attribute or condition that must be met.
Criteria: the plural set of standards
Criteria (plural) refers to multiple criteria. When you establish more than one condition, benchmark, or yardstick, you are defining criteria. Criteria typically work together to form a comprehensive evaluation framework. Each item within the set can itself be a criterion.
Grammatical Usage Patterns
Use criterion when you mean one distinct standard. It functions as a count noun and takes a singular verb. Use criteria when you reference two or more such standards. It also takes a plural verb. Avoid using criteria as a singular noun in careful technical, academic, or policy writing, even though this usage occasionally appears in informal contexts.
Subject-verb agreement examples
- The criterion is clear and measurable.
- The criteria are documented in the policy.
Pronoun reference
Because criterion is singular, it takes singular pronouns (it, this, that). Criteria is plural and takes plural pronouns (they, these, those).
- This criterion is important because it affects eligibility.
- These criteria are applied consistently across all applications.
Common Mistakes and Misuse
Confusing criterion and criteria is common, especially when writers treat criteria as a singular mass noun. Phrases like “the criteria is” or “these criteria is” are incorrect in formal usage. Another mistake is using criterias as a plural, which is nonstandard. Stick with criteria as the correct plural form. Additionally, criterion is occasionally misused to mean a recommendation or preference, when it actually denotes a measurable condition or test.
When to Use Criterion
Use criterion when you are describing a single, specific test or condition. Examples include accreditation benchmarks, quality thresholds, safety requirements, regulatory checks, selection filters, or pass/fail conditions. If you can replace the word with “standard” or “measure” and the sentence remains clear, you likely need the singular form.
- The criterion for approval is consistent documentation.
- Each criterion must be observable and verifiable.
When to Use Criteria
Use criteria when you are describing multiple standards or conditions that together define how something is judged. This applies to scoring rubrics, eligibility rules, assessment checklists, governance policies, or design requirements. If you would reference “those” or “these” and the noun is plural, criteria is likely the appropriate choice.
- The selection criteria include experience, portfolio, and references.
- All criteria must be satisfied before project approval.