diagnostic
dy-ug-NOS-tik
/ˌdaɪəɡˈnɒstɪk/
Used for or concerned with identifying the nature, cause, or specific location of a problem or learning weakness.
Administered before or during instruction specifically to pinpoint exact knowledge gaps or learning needs.
The story behind the word. From Greek 'diagnostikos' (able to distinguish), built from 'dia-' (thoroughly) and 'gignoskein' (to know). Originally used exclusively in medicine, educators adopted it in the 20th century to mean diagnosing student learning needs.
Word relationships
- evaluative: Evaluative measures final overall quality, while diagnostic pinpoints specific causes or knowledge gaps.
- analytical: Analytical breaks down information, but diagnostic specifically aims to identify a problem or deficit.
- prognostic: Prognostic predicts future outcomes rather than identifying present causes or gaps.
Commonly confused with
- prognostic: Diagnostic identifies present condition or gaps; prognostic predicts future outcome or growth.
Word family
- diagnose (verb): To identify the nature of a problem.
- diagnosis (noun): The identification of a problem or condition.
Collocations
- diagnostic test
- diagnostic assessment
- diagnostic tool
- diagnostic feature
Example sentences
- "Students completed a diagnostic math assessment on the first day of class so the teacher could identify individual learning gaps." Initial student assessment
- "The diagnostic report indicated that the student excelled at geometry but struggled with algebraic equations." Performance reporting
Memory hook
DIA (thoroughly) + GNOS (know): to know thoroughly what is wrong. Test to diagnose knowledge gaps.
When not to use
Do not confuse with 'summative'; diagnostic specifically pinpoints initial gaps prior to teaching rather than grading final performance.
Fun facts
- In computer software, diagnostic programs run hardware self-checks to detect faulty memory chips before booting the operating system.
Related words
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